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<small>[[Reference:sea-dweller|Sea-Dweller]] → '''16600'''</small>
<small>[[Reference:sea-dweller|Sea-Dweller]] -> '''16600'''</small>


The 16600 is the long-run Sea-Dweller. Twenty years of continuous production from 1989 through 2008, more than any other Sea-Dweller reference, with no immediate successor — when the 16600 ended, the Deepsea 116660 was the larger-case path forward and the 40mm slot stayed empty until the 116600 reissue in 2014. Same case the 16660 established. Same sapphire crystal, same unidirectional bezel, same 1220-metre depth rating, same helium escape valve at 9 o'clock. The change is at the centre of the watch: the caliber 3135 replaces the 3035, and the dial moves through four canonical mark generations that track three decades of Rolex luminous chemistry — tritium, then Luminova, then Super-LumiNova. The 16600 is also the last Sea-Dweller with an aluminum bezel insert and the last to wear tritium. The 116600 that follows breaks both threads.
The 16600 is the long-run Sea-Dweller. Twenty years of continuous production from 1989 through 2008, more than any other Sea-Dweller reference, and no immediate successor: when the 16600 ended, the larger Deepsea 116660 took the family forward and the 40mm slot stayed empty until the 116600 reissue in 2014. The case is the one the 16660 established, with the same sapphire crystal, same unidirectional bezel, same 1220-metre depth rating, same helium escape valve at 9 o'clock. The change is at the centre of the watch. The caliber 3135 replaces the 3035, and the dial moves through four canonical mark generations that track three decades of Rolex luminous chemistry from tritium to Luminova to Super-LumiNova. The 16600 is also the last Sea-Dweller with an aluminum bezel insert and the last to wear tritium. The 116600 that follows breaks both threads.


[[File:Ref 16600 hero.webp|thumb|right|250px|alt=Rolex Sea-Dweller 16600|Rolex Sea-Dweller 16600.]]
[[File:Ref 16600 hero.webp|thumb|right|250px|alt=Rolex Sea-Dweller 16600 — 40mm Oyster, black aluminum bezel, cal 3135, the twenty-year long-run Sea-Dweller. Image via Monochrome.|Rolex Sea-Dweller 16600 — 40mm Oyster, black aluminum bezel, cal 3135, the twenty-year long-run Sea-Dweller. Image via Monochrome.]]


==Core facts==
==Core facts==
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==Where it sits in the line==
==Where it sits in the line==


The 16600 carries the 16660 case forward and replaces the movement. Same body, same bezel, same depth rating, same helium valve — the silhouette stays. The visible change is on the dial face: applied white-gold-surround indices throughout the run (a carryover from late-16660 production) and three transitional lume technologies that mark the production years cleanly enough to date a 16600 from across a room.
The 16600 carries the 16660 case forward and replaces the movement. The body, the bezel, the depth rating, and the helium valve all stay; the visible change is on the dial face. Applied white-gold-surround indices run throughout the production (a carryover from late-16660 production), and three transitional lume technologies mark the production years cleanly enough to date a 16600 from across a room.


The cal 3135 itself is the movement that runs through the Submariner 16610, the GMT-Master II 16710, the Sea-Dweller 16600, and (with Parachrom Blu) the 116600. It is the workhorse Rolex chronometer of the 1990s and 2000s. Among the Sea-Dweller refs, the 16600 is the cal 3135's first generation in the helium-valve case.
The cal 3135 itself is the movement that runs through the Submariner 16610, the GMT-Master II 16710, the Sea-Dweller 16600, and (with Parachrom Blu) the 116600. It is the workhorse Rolex chronometer of the 1990s and 2000s, and the 16600 is its first generation in the helium-valve case.


==Production outline==
==Production outline==


The 16600 production splits cleanly along the lume transitions. The dial marks are the most reliable era markers — better than serial decoding for this reference, since Rolex letter-prefix serials of the 1990s and 2000s do not run strictly chronologically.
The 16600 production splits cleanly along the lume transitions. The dial marks are the most reliable era markers, better than serial decoding for this reference, since Rolex letter-prefix serials of the 1990s and 2000s do not run strictly chronologically.


===MK1 — tritium era (1989 to ~1998)===
===MK1 — tritium era (1989 to ~1998)===
[[File:Ref 16600 christies lot.webp|thumb|right|280px|alt=Rolex Sea-Dweller 16600 — Christie's lot photograph showing the late-1990s production with matte black dial, applied indices, Triplock crown, and helium escape valve at 9.|16600 lot example — Christie's photograph. The 16600 spans 1989-2009 across four dial generations (MK1 tritium → MK2 Luminova → MK3 Super-LumiNova → MK4 short-FT).]]


The earliest 16600 carries a tritium-painted dial with the "SWISS - T<25" marking at 6 o'clock — the post-1971 Bern Convention spec that says the watch's luminous material is tritium-based, less than 25 millicuries. This is the long opening of the production run, R-prefix serials through late U and into early A. The dial inherits the late-16660's white-gold-surround applied indices, with tritium plots applied behind the surrounds. Hands are tritium-matched.


Tritium MK1 dials patina across the long timeline. The lume yellows to honey and cream colours; the surrounds stay bright. A clean tritium 16600 from the late 1990s, with even patina across all twelve plot positions and matched hand colour, is the canonical "vintage 16600" — even though the reference was current production at the time.
The earliest 16600 carries a tritium-painted dial with the "SWISS - T<25" marking at 6 o'clock, the post-1971 Bern Convention spec that declares the luminous material tritium-based and under 25 millicuries. This is the long opening of the production run, R-prefix serials through late U and into early A. The dial inherits the late-16660's white-gold-surround applied indices, with tritium plots applied behind the surrounds, and the hands are tritium-matched.
 
Tritium MK1 dials patina across the long timeline. The lume yellows to honey and cream colours; the surrounds stay bright. A clean tritium 16600 from the late 1990s, with even patina across all twelve plot positions and matched hand colour, is the canonical "vintage 16600" even though the reference was current production at the time.


===MK2 — Luminova transition (late 1998 to early 2000)===
===MK2 — Luminova transition (late 1998 to early 2000)===


Rolex moved the sport line off tritium in 1998. The transition on the 16600 produces the MK2 dial: lume swapped from tritium to Luminova (a Nemoto product, Japan), dial text at 6 o'clock changed to read "SWISS" only — no "T<25", no "MADE". The window is short. A-prefix serials carry the transition; the Watchprosite specialist consensus places the active production for MK2 from late 1998 to very early 2000, when "SWISS MADE" appears as the next configuration. Hands swap to Luminova lume to match. The most collectible 16600 dial variant comes from this approximately one-year window.
Rolex moved the sport line off tritium in 1998. The transition on the 16600 produces the MK2 dial: lume swapped from tritium to Luminova (a Nemoto product, Japan), dial text at 6 o'clock changed to read "SWISS" only, with no "T<25" and no "MADE". The window is short. A-prefix serials carry the transition, and collector consensus on the Rolex Forums dial-marks thread places active MK2 production from late 1998 to very early 2000, when "SWISS MADE" appears as the next configuration. Hands swap to Luminova lume to match. The MK2 is the most collectible 16600 dial variant, on the strength of that roughly one-year production window.


===MK3 — Super-LumiNova ("SWISS MADE", 2000 to end)===
===MK3 — Super-LumiNova ("SWISS MADE", 2000 to end)===


From P-serial onward (~2000) the lume changes again, this time to Super-LumiNova — a Swiss-made successor to Luminova, brighter and longer-glowing. Dial text at 6 reads "SWISS MADE". This is the dominant 16600 dial on the dealer market. Production runs from approximately 2000 through to the 2008 / 2009 end-of-production. The applied indices and white-gold surrounds carry over unchanged.
From P-serial onward (around 2000) the lume changes again, this time to Super-LumiNova, a Swiss-made successor to Luminova that runs brighter and longer. Dial text at 6 reads "SWISS MADE". This is the dominant 16600 dial on the dealer market. Production runs from approximately 2000 through to the 2008 / 2009 end-of-production. The applied indices and white-gold surrounds carry over unchanged.


===MK4 — short-FT variant (overlapping with MK3, K / Z / M cases)===
===MK4 — short-FT variant (overlapping with MK3, K / Z / M cases)===


Inside the Super-LumiNova run sits a sub-variant collectors call MK4: short-FT font typography, subtle differences in coronet, depth-rating, and font weight relative to MK3. The Watchprozine essay documents the print-level diagnostics. The MK4 overlaps MK3 randomly across K, Z, and M serial cases rather than landing in a clean date band, which makes it more of a print-pass variation than a true generation.
Inside the Super-LumiNova run sits a sub-variant collectors call MK4: short-FT font typography, with subtle differences in coronet, depth-rating, and font weight relative to MK3. WatchProZine documents the print-level diagnostics in its dedicated 16600 marks article. The MK4 overlaps MK3 randomly across K, Z, and M serial cases rather than landing in a clean date band, which makes it more of a print-pass variation than a true generation.


===Service dial — "SWISS" only, missing 29 and 31 indices===
===Service dial — "SWISS" only, missing 29 and 31 indices===


A documented service-replacement dial appears MK4-style but reads "SWISS" only at 6 o'clock (the MK2 marking) and lacks the 29 and 31 indices on the minute chapter ring. Universally believed to be a Rolex Service Centre replacement for early MK2 dials. It never appears as factory-original on a complete watch.
A documented service-replacement dial appears MK4-style but reads "SWISS" only at 6 o'clock (the MK2 marking) and lacks the 29 and 31 indices on the minute chapter ring. The collector reading is that this is a Rolex Service Centre replacement for early MK2 dials. It never appears as factory-original on a complete watch.


===End of production (2008 / 2009)===
===End of production (2008 / 2009)===


The 16600 ends production in 2008. Monochrome, Mark Littler, and The Deep Track extend the date to 2009 — most likely a delivery-channel timing difference rather than a real production-line disagreement. The reference has no immediate successor. The Deepsea 116660 launches in 2008 at 44mm, but the 40mm Sea-Dweller slot stays empty until the 116600 reissue at Baselworld 2014.
The 16600 ends production in 2008. Monochrome's 2025 in-depth Sea-Dweller history, Mark Littler's vintage Sea-Dweller guide, and The Deep Track's video retrospective extend the date to 2009, most likely a delivery-channel timing difference rather than a real production-line disagreement. The reference has no immediate successor. The Deepsea 116660 launches in 2008 at 44mm, but the 40mm Sea-Dweller slot stays empty until the 116600 reissue at Baselworld 2014.


==Movement notes==
==Movement notes==


The caliber 3135 replaces the 3035 cleanly:
The caliber 3135 replaces the 3035 cleanly. It runs at 28,800 vph (4 Hz) with 31 jewels (up from the 3035's 27), a power reserve of approximately 48 hours (Rolex spec; Monochrome quotes 50h, but the 48h figure is canonical), quickset date, and hacking seconds. The architectural change that gives the 3135 its name and stability advantage is the full balance bridge that replaces the 3035's balance cock. A free-sprung balance and KIF Elastor shock absorbers complete the package, and every example leaves the factory COSC chronometer certified.


* 31 jewels (up from the 3035's 27)
The cal 3135 also gets the Parachrom Blu hairspring late in its production cycle. Rolex rolled Parachrom Blu into the 3135 family from the mid-2000s, and the 16600 is split: early- and mid-production examples carry the niobium-zirconium Parachrom in chrome-gold finish, late-run examples carry Parachrom Blu. The transition serial is not pinned in published sources. Treat any 16600 before Z-serial as not-Parachrom-Blu unless a watchmaker confirmed it on service; late-Z onward as possibly-Parachrom-Blu; M and V onward as likely-Parachrom-Blu. The 116600 successor is universally Parachrom Blu from launch.
* 28,800 vph / 4 Hz
* Power reserve approximately 48 hours (Rolex spec; Monochrome quotes 50h — the 48h figure is canonical)
* Quickset date, hacking seconds
* Full balance bridge replaces the 3035's balance cock — the structural change that gives the 3135 its name and stability advantage
* Free-sprung balance, KIF Elastor shock absorbers
* COSC chronometer certified
 
The cal 3135 also gets the Parachrom Blu hairspring late in its production cycle. Rolex rolled Parachrom Blu into the 3135 family from the mid-2000s; the 16600 is split — early- and mid-production examples carry the niobium-zirconium Parachrom in chrome-gold finish, late-run examples carry Parachrom Blu. The transition serial is not pinned in published sources. Treat any 16600 before Z-serial as not-Parachrom-Blu unless a watchmaker confirmed it on service; late-Z onward as possibly-Parachrom-Blu; M and V onward as likely-Parachrom-Blu. The 116600 successor is universally Parachrom Blu from launch.


==Dial map==
==Dial map==
Line 114: Line 108:
===MK1 (tritium, "SWISS - T<25")===
===MK1 (tritium, "SWISS - T<25")===


R-prefix to late-U / early-A serials. ~1989 to ~1997/1998. Tritium-painted plots inside the applied white-gold surrounds. Honey or cream lume patina on aged examples. Hands tritium-matched and patina-matched.
R-prefix to late-U / early-A serials, roughly 1989 to 1997 or 1998. Tritium-painted plots inside the applied white-gold surrounds. Honey or cream lume patina on aged examples. Hands tritium-matched and patina-matched.


===MK2 (Luminova, "SWISS")===
===MK2 (Luminova, "SWISS")===


A-prefix only. Late 1998 to early 2000. Luminova lume on both dial and hands. The shortest production window of any 16600 mark and the most collected variant.
A-prefix only, late 1998 to early 2000. Luminova lume on both dial and hands. The shortest production window of any 16600 mark and the most collected variant.


===MK3 (Super-LumiNova, "SWISS MADE")===
===MK3 (Super-LumiNova, "SWISS MADE")===


P-prefix onward. ~2000 to end. The dominant dial on the dealer market. White-gold-surround applied indices unchanged from earlier marks.
P-prefix onward, roughly 2000 to end. The dominant dial on the dealer market. White-gold-surround applied indices unchanged from earlier marks.


===MK4 (short-FT typography, overlapping with MK3)===
===MK4 (short-FT typography, overlapping with MK3)===


Super-LumiNova lume. Print-pass variation on the MK3 typography: short-FT font, subtle coronet adjustments, depth-rating font differences. Overlaps MK3 across K, Z, and M cases without forming its own date band. Mondani's 2018 ''Rolex Submariner – Sea-Dweller – DeepSea'' counts five marks where the online canon (Watchprozine, Watchprosite, Rolex Forums) settles on four plus the service dial; the fifth in Mondani most likely promotes the service dial to a generation.
Super-LumiNova lume. Print-pass variation on the MK3 typography: short-FT font, subtle coronet adjustments, depth-rating font differences. Overlaps MK3 across K, Z, and M cases without forming its own date band. Guido Mondani's ''Rolex Submariner – Sea-Dweller – DeepSea'' (Guido Mondani Editore, 2018, two volumes) counts five marks where the online canon (WatchProZine, Rolex Forums) settles on four plus the service dial; the fifth in Mondani most likely promotes the service dial to a generation.


===Service dial (Rolex Service Centre replacement)===
===Service dial (Rolex Service Centre replacement)===
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===Spider / craquelure — not on the 16600===
===Spider / craquelure — not on the 16600===


Spider crazing on the dial varnish is a 5513 / 1680 gilt-dial pathology and a 16660 MK3 Stern-lacquer pathology. The 16600 does not develop spider damage. Tritium MK1 dials patina the lume plots but the varnish stays intact. Claims of "spider 16600" in dealer listings are misidentified service replacements or refinished dials — strip the claim on sight.
Spider crazing on the dial varnish is a 5513 / 1680 gilt-dial pathology and a 16660 MK3 Stern-lacquer pathology. The 16600 does not develop spider damage. Tritium MK1 dials patina the lume plots but the varnish stays intact. Claims of "spider 16600" in dealer listings are misidentified service replacements or refinished dials. Strip the claim on sight.


==Case, bezel, crystal, and crown notes==
==Case, bezel, crystal, and crown notes==


[[File:Ref 16600 hev_detail.webp|thumb|right|300px|alt=Sea-Dweller helium escape valve close-up|Helium escape valve at 9 o'clock — the operational feature that defines the Sea-Dweller line.]]
[[File:Ref 16600 hev_detail.webp|thumb|right|300px|alt=Sea-Dweller helium escape valve close-up|Helium escape valve at 9 o'clock — the operational feature that defines the Sea-Dweller line.]]
The 16600 case carries forward from the 16660 with no architectural change:
The 16600 case carries forward from the 16660 with no architectural change. Diameter is 40mm Oyster with 20mm lug width, lug-to-lug approximately 46.1mm, and case thickness approximately 14.4mm. The helium escape valve sits at 9 o'clock, the same enlarged valve the 16660 introduced. A flat sapphire crystal sits inside the bezel without a Cyclops, and the unidirectional 60-minute bezel carries a black anodized aluminum insert. The Triplock screw-down crown completes the front.
 
* 40mm Oyster diameter, 20mm lug width
* Lug-to-lug approximately 46.1mm, case thickness approximately 14.4mm
* Helium escape valve at 9 o'clock — the same enlarged valve the 16660 introduced
* Flat sapphire crystal, no Cyclops
* Black anodized aluminum bezel insert, unidirectional 60-minute
* Triplock screw-down crown


===Caseback===
===Caseback===


ROLEX OYSTER with twin coronets and "ORIGINAL GAS ESCAPE VALVE", black-fill. No variation across the 20-year standard production run. The Sea-Dweller (along with the Milgauss) is one of the only Rolex sport-line references with engraved casebacks — the standard sport-line caseback is plain. The engraved caseback advertises the helium valve as a feature.
ROLEX OYSTER with twin coronets and "ORIGINAL GAS ESCAPE VALVE", black-fill. No variation across the 20-year standard production run. The Sea-Dweller, along with the Milgauss, is one of the only Rolex sport-line references with engraved casebacks; the standard sport-line caseback is plain. The engraved caseback advertises the helium valve as a feature.


Legitimate caseback engraving variations on a 16600 are limited to: standard (the description above), straight COMEX engraving (1992 first batch), curved COMEX engraving (1997 second batch), and Polizia di Stato 1958-2008 with optional diver patent number (2008 Polipetto commission). Aftermarket engravings (owner initials, retirement dates) appear on private commissions but never factory.
Legitimate caseback engraving variations on a 16600 are limited to four configurations: standard (as described above), straight COMEX engraving (1992 first batch), curved COMEX engraving (1997 second batch), and Polizia di Stato 1958-2008 with optional diver patent number (2008 Polipetto commission). Aftermarket engravings such as owner initials and retirement dates appear on private commissions but never factory.


===Bezel insert===
===Bezel insert===


The 16600's aluminum insert is the same black anodized print the 16660 carried. Silver-print numerals on early examples, white-print on later — a transition that mirrors the broader Submariner 14060 / GMT 16710 bezel insert history. The 16600 is the last Sea-Dweller with an aluminum insert; the 116600 introduces the Cerachrom ceramic insert.
The 16600's aluminum insert is the same black anodized print the 16660 carried. Silver-print numerals appear on early examples and white-print on later, a transition that mirrors the broader Submariner 14060 and GMT 16710 bezel insert history. The 16600 is the last Sea-Dweller with an aluminum insert; the 116600 introduces the Cerachrom ceramic insert.


==Bracelet, end-links, clasps==
==Bracelet, end-links, clasps==
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End-link code 592B is the canonical SEL (Solid End Link) fitment on the 16600. The 501B end-link belongs to the Submariner / GMT lug pattern and should not appear on a factory 16600.
End-link code 592B is the canonical SEL (Solid End Link) fitment on the 16600. The 501B end-link belongs to the Submariner / GMT lug pattern and should not appear on a factory 16600.


The 93160 transitions internally from hollow centre links + folded SEL on early production to solid centre links + solid end-links from approximately 2003 to 2007 (the broader Rolex sport-line solid-link transition). Many late M and V serial 16600s came factory-fitted with the solid-link 93160. The reference number stays 93160 across the transition.
The 93160 transitions internally from hollow centre links plus folded SEL on early production to solid centre links plus solid end-links from approximately 2003 to 2007, tracking the broader Rolex sport-line solid-link transition. Many late M and V serial 16600s came factory-fitted with the solid-link 93160. The reference number stays 93160 across the transition.


The clasp carries the Fliplock diver's wetsuit extension. The clasp's two-letter date code (for example "K6" = November 1985 — generation-1 codes; the 1990s codes use a different system) dates the bracelet, not the watch head. Service bracelets often carry date codes far later than the case serial.
The clasp carries the Fliplock diver's wetsuit extension. The clasp's two-letter date code (for example "K6" = November 1985 for generation-1 codes; the 1990s codes use a different system) dates the bracelet, not the watch head. Service bracelets often carry date codes far later than the case serial.


==Special branches==
==Special branches==
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===COMEX 16600===
===COMEX 16600===


The COMEX 16600 is the final Rolex–COMEX delivery — the partnership ends with this reference. Production ran in two batches, both with tritium MK1 dials.
The COMEX 16600 is the final Rolex–COMEX delivery; the partnership ends with this reference. Production ran in two batches, both with tritium MK1 dials.


1992 first batch: approximately 100 watches, COMEX issue numbers 32XX (verified examples include 3204, 3211, 3220, 3277). "Straight COMEX engraving" on the caseback — "ROLEX" and "COMEX" in straight lines centre-puck.
The 1992 first batch was approximately 100 watches, COMEX issue numbers 32XX (verified examples include 3204, 3211, 3220, 3277). The caseback carries "straight COMEX engraving" with "ROLEX" and "COMEX" set in straight lines across the centre-puck.


1997 second batch: approximately 100 watches, COMEX issue numbers 33XX (verified examples 3379, 3382, 3449). "Curved COMEX engraving" — "ROLEX" and "COMEX" following the caseback periphery in a curved layout. This is the final Rolex–COMEX delivery batch.
The 1997 second batch was approximately 100 watches, COMEX issue numbers 33XX (verified examples 3379, 3382, 3449). The caseback carries "curved COMEX engraving" with "ROLEX" and "COMEX" following the caseback periphery in a curved layout. This is the final Rolex–COMEX delivery batch.


Both batches use the tritium MK1 dial despite the 1997 batch arriving in the production window that also contained Luminova MK2 dials on civilian production — the COMEX batches deliberately stayed on the older lume specification.
Both batches use the tritium MK1 dial despite the 1997 batch arriving in the production window that also contained Luminova MK2 dials on civilian production. The COMEX batches deliberately stayed on the older lume specification.


The COMEX logo prints above 6 o'clock on the dial. The COMEX issue number engraves on the caseback exterior.
The COMEX logo prints above 6 o'clock on the dial. The COMEX issue number engraves on the caseback exterior.
Line 191: Line 177:
Mavrostomos's 16600 is the most cited individual Sea-Dweller in modern auction literature. COMEX issue 3379, case serial U139'751, movement 39'643'660. Second batch (1997), curved caseback engraving.
Mavrostomos's 16600 is the most cited individual Sea-Dweller in modern auction literature. COMEX issue 3379, case serial U139'751, movement 39'643'660. Second batch (1997), curved caseback engraving.


The caseback carries a later personal inscription added after the watch was issued: "Theo Mavrostomos – Hydrax – 701 M" — commemorating Mavrostomos's 1992 HYDRA X simulated dive, when he reached 701 metres (2,300 feet) over a 43-day saturation, breathing the Hydeliox mix. The personalisation makes the watch unique within the 33XX batch and provides the auction narrative that has carried it through three sales in seven years.
The caseback carries a later personal inscription added after the watch was issued: "Theo Mavrostomos – Hydrax – 701 M", commemorating Mavrostomos's 1992 HYDRA X simulated dive, when he reached 701 metres (2,300 feet) over a 43-day saturation breathing the Hydeliox mix. The personalisation makes the watch unique within the 33XX batch and provides the auction narrative that has carried it through three sales in seven years.
 
Auction trail:
 
* Antiquorum Monaco, 17 July 2018, lot 314 — first surfaced sale.
* Sotheby's Geneva GE1901, May 2019, lot 53 — estimate CHF 80,000 to 120,000.
* Phillips New York XII, 7 June 2025, lot 89 — estimate USD 50,000 to 100,000.


The trio of appearances anchors the COMEX 16600 valuation conversation across the 2018 to 2025 market cycle.
The auction trail runs from Antiquorum Monaco, 17 July 2018, lot 314 (first surfaced sale), to Sotheby's Geneva GE1901, May 2019, lot 53 (estimate CHF 80,000 to 120,000), to Phillips New York XII, 7 June 2025, lot 89 (estimate USD 50,000 to 100,000). The trio of appearances anchors the COMEX 16600 valuation conversation across the 2018 to 2025 market cycle.


===Polipetto — Polizia di Stato Sommozzatori (2008)===
===Polipetto — Polizia di Stato Sommozzatori (2008)===


Separate from COMEX, often confused with it: the Polipetto 16600 was commissioned in 2008 for the 50th anniversary of the Italian State Police Diving Corps — the Polizia di Stato Sommozzatori, "Teseo Tesei" Divers and Raiders Command, based at La Spezia (1958–2008).
Separate from COMEX, and often confused with it, the Polipetto 16600 was commissioned in 2008 for the 50th anniversary of the Italian State Police Diving Corps: the Polizia di Stato Sommozzatori, "Teseo Tesei" Divers and Raiders Command, based at La Spezia (1958–2008).


Production: 78 examples total. Of those, 28 are personalised with the recipient diver's certification number engraved on the caseback. The dial carries a small-octopus emblem at 6 o'clock — the "polipetto" that gives the variant its name. The caseback text reads "POLIZIA DI STATO SOMMOZZATORI 1958-2008", with the diver's name and patent number added for the 28 personalised pieces.
Production was 78 examples total. Of those, 28 are personalised with the recipient diver's certification number engraved on the caseback. The dial carries a small-octopus emblem at 6 o'clock, the "polipetto" that gives the variant its name. The caseback text reads "POLIZIA DI STATO SOMMOZZATORI 1958-2008", with the diver's name and patent number added for the 28 personalised pieces.


One documented personalised example: Inspector Rosario Sanarico, patent 126, case serial V31XXXX, Rolex guarantee dated December 2008 from Montres et Bijoux La Spezia (the retailer that handled the commission). Sanarico died in service in Padua in February 2016.
One documented personalised example: Inspector Rosario Sanarico, patent 126, case serial V31XXXX, Rolex guarantee dated December 2008 from Montres et Bijoux La Spezia (the retailer that handled the commission). Sanarico died in service in Padua in February 2016.


The Monaco Legend Auctions 26–27 April 2025 sale lot 89 — case V314884, NOS with stickers, full set with the original December 2008 La Spezia guarantee — hammered EUR 123,500 against an estimate of EUR 120,000 to 240,000. Chrono24 listings carry a NOS full-set Polipetto at USD 304,162. The Polipetto trades at a premium even relative to the COMEX 16600 because the production is smaller and the institutional provenance is tighter.
The Monaco Legend Auctions 26–27 April 2025 sale lot 89, case V314884, NOS with stickers and full set including the original December 2008 La Spezia guarantee, hammered EUR 123,500 against an estimate of EUR 120,000 to 240,000. The Polipetto trades at a premium even relative to the COMEX 16600 because the production is smaller and the institutional provenance is tighter.


===Military / government===
===Military / government===
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|}
|}


Market bands (2025–2026):
Market bands for 2025 and 2026 settle into three tiers. A standard 16600 trades from USD 8,000 to 14,000 for typical condition, climbing to USD 15,000 to 17,000 for clean MK1 or MK2 with full set. A COMEX 16600 runs from USD 100,000 to over 200,000, with provenance lots such as Mavrostomos reaching the mid six figures. A Polipetto NOS full-set sits at EUR 120,000 to over 300,000 depending on personalisation status.


* Standard 16600 — USD 8,000 to 14,000 for typical condition; USD 15,000 to 17,000 for clean MK1 or MK2 with full set.
==Sources==
* COMEX 16600 — USD 100,000 to 200,000-plus. Provenance lots (Mavrostomos) reach the mid six figures.
* Polipetto NOS full-set — EUR 120,000 to 300,000-plus depending on personalisation status.


==Sources==
===Primary and specialist===


* ''The Vintage Rolex Field Manual'' — Colin A. White, Morning Tundra
* ''The Vintage Rolex Field Manual'' — Colin A. White, Morning Tundra
* [https://www.hodinkee.com/articles/rolex-sea-dweller-reference-points Hodinkee editorial, "Reference Points: Understanding the Rolex Sea-Dweller", Hodinkee, 2018]
* [https://www.sothebys.com/en/buy/auction/2021/fine-watches-12/ Sotheby's Watches Department, "Sotheby's Fine Watches — Reference 16600 lots", Sotheby's, 2021]
* [https://www.sothebys.com/en/auctions/ecatalogue/2019/important-watches-ge1901/lot.53.html Sotheby's Watches Department, "Sotheby's Geneva GE1901 — Theo Mavrostomos COMEX 16600 (lot 53)", Sotheby's, 2019-05]
* [https://www.sothebys.com/en/auctions/ecatalogue/2019/important-watches-ge1901/lot.46.html Sotheby's Watches Department, "Sotheby's Geneva GE1901 — 1992 first-batch COMEX 16600 (lot 46)", Sotheby's, 2019-05]
* [https://www.phillips.com/article/158512658/a-rolex-sea-dweller-comex-owned-by-legendary-scuba-diver-theo-mavrostomos Phillips editorial, "A Rolex Sea-Dweller COMEX Owned by Legendary Scuba Diver Theo Mavrostomos", Phillips, 2025]
* [https://www.monacolegendauctions.com/auction/exclusive-timepieces-36/lot-89 Monaco Legend editorial, "Polipetto Polizia di Stato 16600 (lot 89, Monaco Apr 2025)", Monaco Legend Auctions, 2025-04]
* [https://mondanibooks.com/ Mondani Family, "Guido Mondani Editore — Rolex Submariner Sea-Dweller DeepSea (2018, 2-vol)", Guido Mondani Editore, 2018]
===Editorial and market===
* [https://monochrome-watches.com/history-rolex-sea-dweller-saturation-dive-watch-helium-escape-valve-deepsea/ Monochrome Watches editorial, "In-Depth: The History of the Rolex Sea-Dweller", Monochrome, 2025]
* [https://monochrome-watches.com/history-rolex-sea-dweller-saturation-dive-watch-helium-escape-valve-deepsea/ Monochrome Watches editorial, "In-Depth: The History of the Rolex Sea-Dweller", Monochrome, 2025]
* [https://www.hodinkee.com/articles/rolex-sea-dweller-reference-points Hodinkee editorial, "Reference Points: Understanding the Rolex Sea-Dweller", Hodinkee, 2018]
* [https://www.watchprozine.com/rolex/sea-dweller-16600-marks/5595173/732/ WatchProZine editorial, "Sea-Dweller 16600 Marks", WatchProZine]
* [https://www.watchprozine.com/rolex/sea-dweller-16600-marks/5595173/732/ WatchProZine editorial, "Sea-Dweller 16600 Marks", WatchProZine]
* [https://ottuhr.com/watch-index/rolex-sea-dweller-16600/ Ottuhr, "Ottuhr — Rolex Sea-Dweller 16600 Reference Report", Ottuhr]
* [https://ottuhr.com/watch-index/rolex-sea-dweller-16600/ Ottuhr, "Ottuhr — Rolex Sea-Dweller 16600 Reference Report", Ottuhr]
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* [https://thedeeptrack.com/video-retrospective-the-rolex-sea-dweller-16600/ The Deep Track editorial, "The Deep Track — Video Retrospective: The Rolex Sea-Dweller 16600", The Deep Track]
* [https://thedeeptrack.com/video-retrospective-the-rolex-sea-dweller-16600/ The Deep Track editorial, "The Deep Track — Video Retrospective: The Rolex Sea-Dweller 16600", The Deep Track]
* [https://www.marklittler.com/a-complete-guide-to-the-rolex-sea-dweller/ Mark Littler, "Mark Littler — A Complete Guide to the Vintage Rolex Sea-Dweller", Mark Littler Ltd]
* [https://www.marklittler.com/a-complete-guide-to-the-rolex-sea-dweller/ Mark Littler, "Mark Littler — A Complete Guide to the Vintage Rolex Sea-Dweller", Mark Littler Ltd]
* [https://www.sothebys.com/en/buy/auction/2021/fine-watches-12/ Sotheby's Watches Department, "Sotheby's Fine Watches — Reference 16600 lots", Sotheby's, 2021]
* [https://www.sothebys.com/en/auctions/ecatalogue/2019/important-watches-ge1901/lot.53.html Sotheby's Watches Department, "Sotheby's Geneva GE1901 — Theo Mavrostomos COMEX 16600 (lot 53)", Sotheby's, 2019-05]
* [https://www.sothebys.com/en/auctions/ecatalogue/2019/important-watches-ge1901/lot.46.html Sotheby's Watches Department, "Sotheby's Geneva GE1901 — 1992 first-batch COMEX 16600 (lot 46)", Sotheby's, 2019-05]
* [https://www.phillips.com/article/158512658/a-rolex-sea-dweller-comex-owned-by-legendary-scuba-diver-theo-mavrostomos Phillips editorial, "A Rolex Sea-Dweller COMEX Owned by Legendary Scuba Diver Theo Mavrostomos", Phillips, 2025]
* [https://www.monacolegendauctions.com/auction/exclusive-timepieces-36/lot-89 Monaco Legend editorial, "Polipetto Polizia di Stato 16600 (lot 89, Monaco Apr 2025)", Monaco Legend Auctions, 2025-04]
* [https://lwmitalia.com/watch/rolex-sea-dweller-16600-date-polipetto-italian-police-assigned-full-set-nos/ LWM Italia editorial, "LWM Italia — Sanarico Polipetto 16600 (patent 126)", LWM Italia]
* [https://lwmitalia.com/watch/rolex-sea-dweller-16600-date-polipetto-italian-police-assigned-full-set-nos/ LWM Italia editorial, "LWM Italia — Sanarico Polipetto 16600 (patent 126)", LWM Italia]
* [https://www.rolexforums.com/showthread.php?t=265018 forum community, "Rolex Forums — Sea-Dweller 16600 Dial Marks (thread 265018)", Rolex Forums]
* [https://www.rolexforums.com/showthread.php?t=265018 forum community, "Rolex Forums — Sea-Dweller 16600 Dial Marks (thread 265018)", Rolex Forums]
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* [https://watchbase.com/rolex/sea-dweller/16600-comex-mk2 Watchbase, "Watchbase — Rolex Sea-Dweller 16600 COMEX Mk2", Watchbase]
* [https://watchbase.com/rolex/sea-dweller/16600-comex-mk2 Watchbase, "Watchbase — Rolex Sea-Dweller 16600 COMEX Mk2", Watchbase]
* [https://rolexpassionreport.com/15606/the-evolution-of-rolex-luminous/ Rolex Passion Report editorial, "Rolex Passion Report — The Evolution of Rolex Luminous (Tritium → Chromalight)", Rolex Passion Report]
* [https://rolexpassionreport.com/15606/the-evolution-of-rolex-luminous/ Rolex Passion Report editorial, "Rolex Passion Report — The Evolution of Rolex Luminous (Tritium → Chromalight)", Rolex Passion Report]
* [https://mondanibooks.com/ Mondani Family, "Guido Mondani Editore — Rolex Submariner Sea-Dweller DeepSea (2018, 2-vol)", Guido Mondani Editore, 2018]


[[Category:Sea-Dweller]]
[[Category:Sea-Dweller]]
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Latest revision as of 05:13, 28 May 2026


Sea-Dweller -> 16600

The 16600 is the long-run Sea-Dweller. Twenty years of continuous production from 1989 through 2008, more than any other Sea-Dweller reference, and no immediate successor: when the 16600 ended, the larger Deepsea 116660 took the family forward and the 40mm slot stayed empty until the 116600 reissue in 2014. The case is the one the 16660 established, with the same sapphire crystal, same unidirectional bezel, same 1220-metre depth rating, same helium escape valve at 9 o'clock. The change is at the centre of the watch. The caliber 3135 replaces the 3035, and the dial moves through four canonical mark generations that track three decades of Rolex luminous chemistry from tritium to Luminova to Super-LumiNova. The 16600 is also the last Sea-Dweller with an aluminum bezel insert and the last to wear tritium. The 116600 that follows breaks both threads.

Rolex Sea-Dweller 16600 — 40mm Oyster, black aluminum bezel, cal 3135, the twenty-year long-run Sea-Dweller. Image via Monochrome.
Rolex Sea-Dweller 16600 — 40mm Oyster, black aluminum bezel, cal 3135, the twenty-year long-run Sea-Dweller. Image via Monochrome.

Core facts

detail value
reference 16600
family Sea-Dweller
production 1989 to 2008 (delivery stock continues through 2009 in some readings)
run length 20 years — the longest of any Sea-Dweller reference
movement caliber 3135, 31 jewels, 28,800 vph, quickset date, ~48h power reserve
case 40mm, helium escape valve at 9 o'clock, Triplock crown
crystal flat sapphire, no Cyclops
bezel unidirectional 60-minute, black aluminum insert
depth 1220m / 4000ft
dial marks MK1 tritium, MK2 Luminova, MK3 Super-LumiNova, MK4 short-FT
predecessor 16660
successor 116600 (2014, after a six-year 40mm-case gap)

Where it sits in the line

The 16600 carries the 16660 case forward and replaces the movement. The body, the bezel, the depth rating, and the helium valve all stay; the visible change is on the dial face. Applied white-gold-surround indices run throughout the production (a carryover from late-16660 production), and three transitional lume technologies mark the production years cleanly enough to date a 16600 from across a room.

The cal 3135 itself is the movement that runs through the Submariner 16610, the GMT-Master II 16710, the Sea-Dweller 16600, and (with Parachrom Blu) the 116600. It is the workhorse Rolex chronometer of the 1990s and 2000s, and the 16600 is its first generation in the helium-valve case.

Production outline

The 16600 production splits cleanly along the lume transitions. The dial marks are the most reliable era markers, better than serial decoding for this reference, since Rolex letter-prefix serials of the 1990s and 2000s do not run strictly chronologically.

MK1 — tritium era (1989 to ~1998)

Rolex Sea-Dweller 16600 — Christie's lot photograph showing the late-1990s production with matte black dial, applied indices, Triplock crown, and helium escape valve at 9.
16600 lot example — Christie's photograph. The 16600 spans 1989-2009 across four dial generations (MK1 tritium → MK2 Luminova → MK3 Super-LumiNova → MK4 short-FT).


The earliest 16600 carries a tritium-painted dial with the "SWISS - T<25" marking at 6 o'clock, the post-1971 Bern Convention spec that declares the luminous material tritium-based and under 25 millicuries. This is the long opening of the production run, R-prefix serials through late U and into early A. The dial inherits the late-16660's white-gold-surround applied indices, with tritium plots applied behind the surrounds, and the hands are tritium-matched.

Tritium MK1 dials patina across the long timeline. The lume yellows to honey and cream colours; the surrounds stay bright. A clean tritium 16600 from the late 1990s, with even patina across all twelve plot positions and matched hand colour, is the canonical "vintage 16600" even though the reference was current production at the time.

MK2 — Luminova transition (late 1998 to early 2000)

Rolex moved the sport line off tritium in 1998. The transition on the 16600 produces the MK2 dial: lume swapped from tritium to Luminova (a Nemoto product, Japan), dial text at 6 o'clock changed to read "SWISS" only, with no "T<25" and no "MADE". The window is short. A-prefix serials carry the transition, and collector consensus on the Rolex Forums dial-marks thread places active MK2 production from late 1998 to very early 2000, when "SWISS MADE" appears as the next configuration. Hands swap to Luminova lume to match. The MK2 is the most collectible 16600 dial variant, on the strength of that roughly one-year production window.

MK3 — Super-LumiNova ("SWISS MADE", 2000 to end)

From P-serial onward (around 2000) the lume changes again, this time to Super-LumiNova, a Swiss-made successor to Luminova that runs brighter and longer. Dial text at 6 reads "SWISS MADE". This is the dominant 16600 dial on the dealer market. Production runs from approximately 2000 through to the 2008 / 2009 end-of-production. The applied indices and white-gold surrounds carry over unchanged.

MK4 — short-FT variant (overlapping with MK3, K / Z / M cases)

Inside the Super-LumiNova run sits a sub-variant collectors call MK4: short-FT font typography, with subtle differences in coronet, depth-rating, and font weight relative to MK3. WatchProZine documents the print-level diagnostics in its dedicated 16600 marks article. The MK4 overlaps MK3 randomly across K, Z, and M serial cases rather than landing in a clean date band, which makes it more of a print-pass variation than a true generation.

Service dial — "SWISS" only, missing 29 and 31 indices

A documented service-replacement dial appears MK4-style but reads "SWISS" only at 6 o'clock (the MK2 marking) and lacks the 29 and 31 indices on the minute chapter ring. The collector reading is that this is a Rolex Service Centre replacement for early MK2 dials. It never appears as factory-original on a complete watch.

End of production (2008 / 2009)

The 16600 ends production in 2008. Monochrome's 2025 in-depth Sea-Dweller history, Mark Littler's vintage Sea-Dweller guide, and The Deep Track's video retrospective extend the date to 2009, most likely a delivery-channel timing difference rather than a real production-line disagreement. The reference has no immediate successor. The Deepsea 116660 launches in 2008 at 44mm, but the 40mm Sea-Dweller slot stays empty until the 116600 reissue at Baselworld 2014.

Movement notes

The caliber 3135 replaces the 3035 cleanly. It runs at 28,800 vph (4 Hz) with 31 jewels (up from the 3035's 27), a power reserve of approximately 48 hours (Rolex spec; Monochrome quotes 50h, but the 48h figure is canonical), quickset date, and hacking seconds. The architectural change that gives the 3135 its name and stability advantage is the full balance bridge that replaces the 3035's balance cock. A free-sprung balance and KIF Elastor shock absorbers complete the package, and every example leaves the factory COSC chronometer certified.

The cal 3135 also gets the Parachrom Blu hairspring late in its production cycle. Rolex rolled Parachrom Blu into the 3135 family from the mid-2000s, and the 16600 is split: early- and mid-production examples carry the niobium-zirconium Parachrom in chrome-gold finish, late-run examples carry Parachrom Blu. The transition serial is not pinned in published sources. Treat any 16600 before Z-serial as not-Parachrom-Blu unless a watchmaker confirmed it on service; late-Z onward as possibly-Parachrom-Blu; M and V onward as likely-Parachrom-Blu. The 116600 successor is universally Parachrom Blu from launch.

Dial map

MK1 (tritium, "SWISS - T<25")

R-prefix to late-U / early-A serials, roughly 1989 to 1997 or 1998. Tritium-painted plots inside the applied white-gold surrounds. Honey or cream lume patina on aged examples. Hands tritium-matched and patina-matched.

MK2 (Luminova, "SWISS")

A-prefix only, late 1998 to early 2000. Luminova lume on both dial and hands. The shortest production window of any 16600 mark and the most collected variant.

MK3 (Super-LumiNova, "SWISS MADE")

P-prefix onward, roughly 2000 to end. The dominant dial on the dealer market. White-gold-surround applied indices unchanged from earlier marks.

MK4 (short-FT typography, overlapping with MK3)

Super-LumiNova lume. Print-pass variation on the MK3 typography: short-FT font, subtle coronet adjustments, depth-rating font differences. Overlaps MK3 across K, Z, and M cases without forming its own date band. Guido Mondani's Rolex Submariner – Sea-Dweller – DeepSea (Guido Mondani Editore, 2018, two volumes) counts five marks where the online canon (WatchProZine, Rolex Forums) settles on four plus the service dial; the fifth in Mondani most likely promotes the service dial to a generation.

Service dial (Rolex Service Centre replacement)

MK4-style face print, "SWISS" only at 6 (the MK2 marking), missing 29 and 31 minute indices. Always a service replacement, never factory-original on a complete watch.

"FT-position" tell

A useful cross-check across the run: on the MK1 dial, the "f" of "ft" in the depth rating sits above the "E" in SUPERLATIVE; on MK2 and MK4, the "f" sits above the "V". The FT position is the first diagnostic to check when grading a 16600 dial against its serial.

Spider / craquelure — not on the 16600

Spider crazing on the dial varnish is a 5513 / 1680 gilt-dial pathology and a 16660 MK3 Stern-lacquer pathology. The 16600 does not develop spider damage. Tritium MK1 dials patina the lume plots but the varnish stays intact. Claims of "spider 16600" in dealer listings are misidentified service replacements or refinished dials. Strip the claim on sight.

Case, bezel, crystal, and crown notes

Sea-Dweller helium escape valve close-up
Helium escape valve at 9 o'clock — the operational feature that defines the Sea-Dweller line.

The 16600 case carries forward from the 16660 with no architectural change. Diameter is 40mm Oyster with 20mm lug width, lug-to-lug approximately 46.1mm, and case thickness approximately 14.4mm. The helium escape valve sits at 9 o'clock, the same enlarged valve the 16660 introduced. A flat sapphire crystal sits inside the bezel without a Cyclops, and the unidirectional 60-minute bezel carries a black anodized aluminum insert. The Triplock screw-down crown completes the front.

Caseback

ROLEX OYSTER with twin coronets and "ORIGINAL GAS ESCAPE VALVE", black-fill. No variation across the 20-year standard production run. The Sea-Dweller, along with the Milgauss, is one of the only Rolex sport-line references with engraved casebacks; the standard sport-line caseback is plain. The engraved caseback advertises the helium valve as a feature.

Legitimate caseback engraving variations on a 16600 are limited to four configurations: standard (as described above), straight COMEX engraving (1992 first batch), curved COMEX engraving (1997 second batch), and Polizia di Stato 1958-2008 with optional diver patent number (2008 Polipetto commission). Aftermarket engravings such as owner initials and retirement dates appear on private commissions but never factory.

Bezel insert

The 16600's aluminum insert is the same black anodized print the 16660 carried. Silver-print numerals appear on early examples and white-print on later, a transition that mirrors the broader Submariner 14060 and GMT 16710 bezel insert history. The 16600 is the last Sea-Dweller with an aluminum insert; the 116600 introduces the Cerachrom ceramic insert.

Bracelet, end-links, clasps

The 16600 wears the reference 93160 Oyster bracelet throughout its production. The fitment is confirmed across Sotheby's and Bonhams lot cataloguing. The 93150 reference is the Submariner bracelet, with a different lug pattern and end-link family; claims of "93150 on 16600" misread the period.

End-link code 592B is the canonical SEL (Solid End Link) fitment on the 16600. The 501B end-link belongs to the Submariner / GMT lug pattern and should not appear on a factory 16600.

The 93160 transitions internally from hollow centre links plus folded SEL on early production to solid centre links plus solid end-links from approximately 2003 to 2007, tracking the broader Rolex sport-line solid-link transition. Many late M and V serial 16600s came factory-fitted with the solid-link 93160. The reference number stays 93160 across the transition.

The clasp carries the Fliplock diver's wetsuit extension. The clasp's two-letter date code (for example "K6" = November 1985 for generation-1 codes; the 1990s codes use a different system) dates the bracelet, not the watch head. Service bracelets often carry date codes far later than the case serial.

Special branches

COMEX 16600

The COMEX 16600 is the final Rolex–COMEX delivery; the partnership ends with this reference. Production ran in two batches, both with tritium MK1 dials.

The 1992 first batch was approximately 100 watches, COMEX issue numbers 32XX (verified examples include 3204, 3211, 3220, 3277). The caseback carries "straight COMEX engraving" with "ROLEX" and "COMEX" set in straight lines across the centre-puck.

The 1997 second batch was approximately 100 watches, COMEX issue numbers 33XX (verified examples 3379, 3382, 3449). The caseback carries "curved COMEX engraving" with "ROLEX" and "COMEX" following the caseback periphery in a curved layout. This is the final Rolex–COMEX delivery batch.

Both batches use the tritium MK1 dial despite the 1997 batch arriving in the production window that also contained Luminova MK2 dials on civilian production. The COMEX batches deliberately stayed on the older lume specification.

The COMEX logo prints above 6 o'clock on the dial. The COMEX issue number engraves on the caseback exterior.

Theo Mavrostomos COMEX 16600 — the most-documented example

Mavrostomos's 16600 is the most cited individual Sea-Dweller in modern auction literature. COMEX issue 3379, case serial U139'751, movement 39'643'660. Second batch (1997), curved caseback engraving.

The caseback carries a later personal inscription added after the watch was issued: "Theo Mavrostomos – Hydrax – 701 M", commemorating Mavrostomos's 1992 HYDRA X simulated dive, when he reached 701 metres (2,300 feet) over a 43-day saturation breathing the Hydeliox mix. The personalisation makes the watch unique within the 33XX batch and provides the auction narrative that has carried it through three sales in seven years.

The auction trail runs from Antiquorum Monaco, 17 July 2018, lot 314 (first surfaced sale), to Sotheby's Geneva GE1901, May 2019, lot 53 (estimate CHF 80,000 to 120,000), to Phillips New York XII, 7 June 2025, lot 89 (estimate USD 50,000 to 100,000). The trio of appearances anchors the COMEX 16600 valuation conversation across the 2018 to 2025 market cycle.

Polipetto — Polizia di Stato Sommozzatori (2008)

Separate from COMEX, and often confused with it, the Polipetto 16600 was commissioned in 2008 for the 50th anniversary of the Italian State Police Diving Corps: the Polizia di Stato Sommozzatori, "Teseo Tesei" Divers and Raiders Command, based at La Spezia (1958–2008).

Production was 78 examples total. Of those, 28 are personalised with the recipient diver's certification number engraved on the caseback. The dial carries a small-octopus emblem at 6 o'clock, the "polipetto" that gives the variant its name. The caseback text reads "POLIZIA DI STATO SOMMOZZATORI 1958-2008", with the diver's name and patent number added for the 28 personalised pieces.

One documented personalised example: Inspector Rosario Sanarico, patent 126, case serial V31XXXX, Rolex guarantee dated December 2008 from Montres et Bijoux La Spezia (the retailer that handled the commission). Sanarico died in service in Padua in February 2016.

The Monaco Legend Auctions 26–27 April 2025 sale lot 89, case V314884, NOS with stickers and full set including the original December 2008 La Spezia guarantee, hammered EUR 123,500 against an estimate of EUR 120,000 to 240,000. The Polipetto trades at a premium even relative to the COMEX 16600 because the production is smaller and the institutional provenance is tighter.

Military / government

No formal military issue of the 16600 is documented in the canon. USN and SBS programmes that issued earlier Submariners ran their course before the 16600 launched; later-issued divers received the 116600 / 116610-spec generation. The Polipetto is the closest institutional issue to a military-issue Sea-Dweller in the 16600 era.

Auction record

date house configuration result
Jun 2025 Phillips New York XII lot 89 Mavrostomos COMEX 16600 issue 3379, case U139'751 (third auction appearance) estimate USD 50,000–100,000
May 2019 Sotheby's Geneva GE1901 lot 53 Mavrostomos COMEX 16600 estimate CHF 80,000–120,000
May 2019 Sotheby's Geneva GE1901 lot 46 1992 first-batch COMEX 16600 straight caseback engraving, case N440484 estimate CHF 70,000–90,000
Apr 2025 Monaco Legend Auctions lot 89 Polipetto NOS case V314884, full set with La Spezia Dec 2008 guarantee EUR 123,500 (estimate EUR 120,000–240,000)
Jul 2021 Antiquorum Monaco lot 341 COMEX 16600 No. 3449 (1997 second batch) —
May 2016 Phillips Geneva Watch Auction THREE lot 119 COMEX 16600 —
May 2014 Christie's sale 1401 "Important Watches" COMEX 16600 —
Sep 2025 Osenat France standard 16600 USD 16,631
Sep 2025 Sotheby's online France standard 16600 USD 13,872 (+71% over estimate)
Jul 2018 Antiquorum Monaco lot 314 Mavrostomos COMEX 16600 (first surfaced sale) —

Market bands for 2025 and 2026 settle into three tiers. A standard 16600 trades from USD 8,000 to 14,000 for typical condition, climbing to USD 15,000 to 17,000 for clean MK1 or MK2 with full set. A COMEX 16600 runs from USD 100,000 to over 200,000, with provenance lots such as Mavrostomos reaching the mid six figures. A Polipetto NOS full-set sits at EUR 120,000 to over 300,000 depending on personalisation status.

Sources

Primary and specialist

Editorial and market

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