Reference:16750: Difference between revisions

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<small>[[Reference:gmt-master|GMT-Master]] -> '''16750'''</small>
<small>[[Reference:gmt-master|GMT-Master]] -> '''16750'''</small>


The [[Reference:16750|16750]] is the first five-digit GMT-Master and the bridge between the 1675 and the 16760 / 16710 generation. Caliber 3075 raised the beat rate from 19,800 to 28,800 vph and added a quick-set date, but the older caller-GMT mechanic stayed. The 24-hour hand still tracks the local hour hand, and the second time zone still reads off the rotating bezel. The acrylic crystal stayed too. What results is a watch that sits mechanically halfway between the 1675 it replaced and the sapphire-era GMTs that followed.
The 16750 is the first five-digit GMT-Master and the bridge between the 1675 and the 16760 / 16710 generation. Caliber 3075 raised the beat rate from 19,800 to 28,800 vph and added a quick-set date, but the older caller-GMT mechanic stayed. The 24-hour hand still tracks the local hour hand, and the second time zone still reads off the rotating bezel. The acrylic crystal stayed too. What results is a watch that sits mechanically halfway between the 1675 it replaced and the sapphire-era GMTs that followed.


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Latest revision as of 23:53, 9 August 2026


GMT-Master -> 16750

The 16750 is the first five-digit GMT-Master and the bridge between the 1675 and the 16760 / 16710 generation. Caliber 3075 raised the beat rate from 19,800 to 28,800 vph and added a quick-set date, but the older caller-GMT mechanic stayed. The 24-hour hand still tracks the local hour hand, and the second time zone still reads off the rotating bezel. The acrylic crystal stayed too. What results is a watch that sits mechanically halfway between the 1675 it replaced and the sapphire-era GMTs that followed.

Acrylic, linked-hand GMT
Acrylic, linked-hand GMT

Core facts

detail value
reference 16750
family GMT-Master
production 1981 to 1988 (dominant editorial reading); 1979/1980 launch surfaces in some specialist sources. Earliest primary anchor in major-house lots is a documented 27 April 1981 retailer receipt
total examples no published Rolex production figure. Run length is eight years against the 1675's twenty-one — the 16750 is meaningfully scarcer
case 40mm Oyster with crown guards
crystal acrylic with Cyclops
water resistance 100m
movement caliber 3075 — 27 jewels, 28,800 vph, 48-hour reserve. Free-sprung Microstella balance with Breguet overcoil, hacking seconds, quickset date. 28.5 × 6.2mm. Hand-stack order changed from the 1575GMT to hour / GMT / minute / second
GMT mechanic caller GMT — 24-hour hand stays linked to the local hour hand, second zone reads off the bezel
dial generations matte (early, ~1981–1985) → glossy lacquer with applied white-gold-circled tritium indices (~1986 onward); the transition is overlapping rather than a hard cutover, with 1984 examples documented in both finishes
bezel bidirectional 24-hour aluminium insert in Pepsi or all-black. Coke is a 16760 trait, not a 16750 option
bracelet 78360 Oyster with 580 endlinks period-correct; Jubilee 62510H with 501 endlinks optional
successor 16700 caller GMT (1988–1999) and the 16760 flyer GMT-Master II (1983–1988) running concurrently after 1983

Where it sits in the line

The 16750 follows the long 1675 run and is the first GMT-Master with a five-digit reference number. It runs for eight years and ends in 1988, the same year the 16760 retires. The 16760 brings the independent local hour hand and the flyer-GMT mechanic; the 16750 keeps the older linked-hand caller mechanic that defines the original GMT-Master line. The 16700 takes the caller mechanic forward into 1999 with the sapphire crystal and the slightly different caliber 3175.

Quickset date, higher beat rate, and hacking seconds all make the 16750 more modern than a 1675, but mechanically it still behaves like a GMT-Master rather than a GMT-Master II. The acrylic crystal and the 40mm crown-guard case look modern next to the 1675 and read as vintage next to the sapphire-and-flyer 16710 that follows the 16760.

Production outline

Production ran approximately 1981 to 1988 on the dominant editorial reading, though the launch year is contested and some specialist sources push it back to 1979 or 1980. The earliest primary-document anchor is a 27 April 1981 retailer receipt, which came with the full-set example Bonhams sold in 2024. Catalogued examples dated 1980 do surface in the auction record, among them Sotheby's 2020 lot 109, so the earlier reading is not unsupported. The bulk of surviving watches date 1981 onward.

No published Rolex production figure surfaces in the documented sources. Eight years of production against the 1675's twenty-one implies a much smaller volume, and collectors describe the 16750 as "particularly scarce" alongside its predecessor. Matte dials cover only the first four or five years of that run.

Movement notes

Caliber 3075 in 16750
Caliber 3075 in 16750

Caliber 3075 is the headline upgrade over the 1575GMT it replaces. It carries 27 jewels, beats at 28,800 vph against the old 19,800, holds a 48-hour reserve, and adds hacking seconds and a quickset date through the crown, all on a free-sprung Microstella balance with a Breguet overcoil. The movement measures 28.5mm across and 6.2mm thick. Some movement registries quote a reserve nearer 50 hours; 48 is the more conservative figure.

The hand-setting stack also changed from the 1575GMT. On the 3075 the order reads hour, GMT, minute, second from the centre post outward. Despite the higher beat rate and the quickset date, the 3075 retains the linked-hand caller-GMT mechanic. The 24-hour hand cannot be set independent of the local hour hand on the 16750. That step waited for the 3085 in the 16760 (1983) and the 3185 in the 16710 (1989).

The 3075 gives way to the 3175 in the 16700 from 1988 to 1999, a one-reference caliber that keeps the caller mechanic with minor revisions. Service-era swaps from 3075 to 3175 do circulate. The two do not behave identically across hand-setting and date-setting directions, and a 3175 in a 16750 case is a service replacement rather than original fitment.

Dial map

Two dial generations, cleanly mapped, with an overlap between them rather than a cutover. Examples dated 1984 surface in both matte and glossy finishes, which makes that year the crossover zone.

Matte (early, ~1981–1985)

Matte-dial Pepsi 16750
Matte-dial Pepsi 16750

The matte dial is a black ground with painted indices and no white-gold surrounds, carrying tritium across the whole branch. It is the closest visual link to the late-1675 dial, which is why the matte 16750 is the watch most often misread at a glance as a late 1675. The caliber 3075's hand-stack order and the interior case-back reference number are the cleanest tells.

Glossy white-gold-surround (~1986 onward)

Glossy black lacquer carries applied indices in white-gold surrounds, the format that runs forward into the 16760 and 16710. Tritium continues across this generation, and the lume colour matches the matte production, ageing along the same mid-1980s pattern.

Spider crazing

Glossy spider dial 16750
Glossy spider dial 16750

Spider crazing is not a factory variant. Hairline cracks form in the glossy lacquer over time, a defect in the formulation Rolex used for the white-gold-surround dials before later reformulations. Affected dials were often replaced under service, so survivors with the crazing intact carry a premium for original-dial integrity. Collectors split on what the pattern is, some reading it as patina and some as damage.

No-Date wording variant

A small group of early glossy dials omit the word "Date" above "GMT-Master" at six o'clock. It is a documented sub-variant rather than a misprint, and it belongs inside the early glossy branch rather than standing as a dial era of its own.

Case, bezel, crystal, and crown

The case is the standard 40mm Oyster with crown guards. The acrylic crystal, with its magnifying Cyclops over the date, is the cleanest single-glance separator from the sapphire-era GMTs that follow. The 100m water-resistance rating carries the 1675 specification forward unchanged.

The bezel is a bidirectional 24-hour aluminium insert. Pepsi and all-black are the only factory configurations on the steel 16750. Coke (red and black) is a 16760 trait and not a documented 16750 option. Insert-back colour is not a clean dating tell on its own; early matte watches sometimes carry red-back inserts, later examples more often blue-back or service-era replacements.

Bracelets, end links, clasps, and packaging notes

Period-correct delivery is the 78360 Oyster with 580 endlinks. Jubilee 62510H with 501 endlinks is the optional configuration. Earlier 580 endlinks are shared across the Submariner 5512 / 5513 / 1680 / 16800, Explorer 1016, and GMT-Master 1675 / 16750. Bracelet originality on a 16750 needs case-and-clasp-date verification rather than relying on the endlink stamp alone.

Surviving examples wear both options. Matte Pepsi watches turn up on Jubilee more often than the glossy / black-bezel side; black and glossy-spider examples lean Oyster. Fitment as found at auction is a poor proxy for original delivery, since the 1980s service window covers most surviving 16750s and bracelet swaps were common.

Special branches

Black-bezel service 16750
Black-bezel service 16750

Omani Police (Khanjar)

16750 with Royal Oman Police emblem dial
16750 with Royal Oman Police emblem at 6 o'clock — one of four documented examples in the same 7.6M serial batch

A small Sultanate-of-Oman commission carries the Khanjar emblem at six o'clock above the depth wording, and it is one of the rarest 16750 sub-types in the auction record. A Bonhams 2021 New Bond Street lot (Bonhams 26687/68, c.1983) carried an estimate of GBP 70,000–100,000, and the catalog noted that a comparable example sold the prior year had a serial number 53 positions away. Phillips Hong Kong XI 2020 lot 1009 adds a parallel anchor. Four 16750 examples are known carrying the Royal Oman Police emblem in white print, all sharing 7.6 million serials and all missing the inside-caseback serial repeat, which points to a single batch produced concurrently for one commission. Khanjar 16750s sit in their own collector tier above the standard market.

Service-replacement examples

Service-replacement dials surface frequently, and the "Swiss-only" dial is the most common pattern: a later Luminova-or-tritium dial carrying only "Swiss" at the bottom in place of the original "T SWISS T" tritium wording. Service-era movement swaps from caliber 3075 to caliber 3175 also circulate.

A 16750 case-back carrying the reference and case number is original. Mid-case serials and movement numbers far apart in production date suggest one or the other has been replaced. A Bonhams Hong Kong 2019 lot with case R672618 and movement number 1,828,172 sits well outside the period 0,3xx,xxx range for 3075 movement numbers and reads as a service-replaced example.

Glossy spider with no-Date wording

The combination of glossy white-gold-surround indices, omitted "Date" wording, and web-like lacquer cracking on the same dial is the strongest single signal of an original late-run 16750 dial. Refinishes and service dials rarely carry any of those three traits in isolation, and almost never all three at once.

Historical market and auction record

Sale Lot Year Serial / config Hammer
Bonhams Knightsbridge 29153/95 2024 full set with dated 27 April 1981 receipt, spare Pepsi insert, brochures GBP 10,240 incl. premium
Sotheby's Watches Online 95 2020 c.1982 matte Pepsi, movement 0,381,752 est. CHF 9,000–12,000
Sotheby's Watches Online 96 2020 c.1984 glossy Pepsi with spider crazing est. CHF 12,000–18,000
Sotheby's Watches 109 2020 c.1980 matte Pepsi, full set est. USD 10,000–15,000
Sotheby's Fine Watches 160 2022 c.1984 glossy Pepsi spider, COSC hang tag est. EUR 8,000–12,000
Sotheby's Important Watches 125 2022 c.1984 Pepsi est. USD 10,000–20,000
Antiquorum Hong Kong 373-296 2024 c.1982 signature dial HKD 68,750 (vs est. HKD 35,000–60,000)
Bonhams Hong Kong Watches 3.0 25282/845 2019 case R672618, mvt 1,828,172 — service-replacement movement HKD 100,625 incl. premium
Bonhams Fine Watches London 26687/68 2021 c.1983 Omani Police Khanjar, 27-jewel cal. 3075, Jubilee est. GBP 70,000–100,000

The 16750 trades as a usable late-vintage GMT-Master rather than an auction trophy. Standard examples cluster GBP 8,000–15,000 / CHF 9,000–18,000 across the major houses depending on dial generation, lume status, and paperwork. Matte Pepsi examples in clean original condition carry the transitional-watch premium. Glossy spider dials with their dial-side originality intact sit at the top of the standard market. The Omani Police Khanjar variant sits above all of it.

Related references

See also the GMT-Master family index, movement reference, bracelet & clasp guide, and serial numbers by year.

Sources

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