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{{DISPLAYTITLE:Reference:MilSub}}
{{DISPLAYTITLE:Reference:MilSub}}
{{#seo:
{{#seo:
|title=Rolex MilSub — Military Submariner 5513 & 5517 Guide | BezelBase
|title=Rolex MilSub — Military Submariner 5513 & 5517 Guide | BezelBase
|description=The MilSub is the British military Submariner: 5513 and 5517 cases configured to MoD spec c.1971-1979 with fixed bars, full 60-minute bezel, sword hands, T SWISS T dial, and broad-arrow caseback engraving. Three batches, two reference numbers, ~250 Batch-3 5517s with ~50 known.
|description=The MilSub is the British military Submariner: 5513 and 5517 cases configured to MoD spec c.1971-1979 with fixed bars, full 60-minute bezel, sword hands, T SWISS T dial, and broad-arrow caseback engraving. Three batches, two reference numbers, ~250 Batch-3 5517s with ~50 known.
|keywords=Rolex, MilSub, military Submariner, 5513, 5517, Royal Navy, SAS, SBS, broad arrow, sword hands, fixed bars, 0552, W10
|keywords=Rolex, MilSub, military Submariner, 5513, 5517, Royal Navy, SAS, SBS, broad arrow, sword hands, fixed bars, 0552, W10
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|og_type=article
|og_type=article
|published_time=2026-04-30T03:27:39Z
|published_time=2026-04-30T03:27:39Z
|modified_time=2026-06-04T04:42:48Z
|modified_time=2026-07-18T14:18:59Z
|robots=index,follow,max-image-preview:large
|robots=index,follow,max-image-preview:large
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<small>[[Reference:submariner|Submariner]] -> '''MilSub'''</small>
<small>[[Reference:submariner|Submariner]] -> '''MilSub'''</small>


The MilSub is the British military Submariner: a Rolex Submariner 5513 or 5517 case configured to Ministry of Defence specification and issued, in batches between roughly 1971 and 1979, to Royal Navy divers (the 0552 / 923-7697 line) and to British Army units including the SAS and Army Air Corps (the W10 line). It is not a separate reference family. It is a configuration: fixed bars soldered into the lugs, a fully graduated 60-minute bezel, sword hands, a T SWISS T tritium dial, and the broad-arrow caseback engraving that identifies British Crown property.
The MilSub is the British military Submariner: a Rolex Submariner 5513 or 5517 case configured to Ministry of Defence specification and issued, in batches between roughly 1971 and 1979, to Royal Navy divers (the 0552 / 923-7697 line) and to British Army units including the SAS and Army Air Corps (the W10 line). The name describes a configuration rather than a reference family. A Submariner earns it by carrying fixed bars in the lugs, a fully graduated 60-minute bezel, sword hands, a T SWISS T tritium dial, and the broad-arrow caseback engraving that marks British Crown property.


The program splits cleanly across three batches and two reference numbers. Batch 1 carries 5513 between the 12-o'clock lugs, runs in the early 3.9M serial cluster, and ships from c.1971-1974. Batch 2 keeps the 5513 lug engraving but adds a 5517 stamp under one lug — the so-called 5513/5517 double-reference watches — and clusters in the 3.926M band with issue years dominated by 1977 and 1979. Batch 3 carries 5517 between the 12-o'clock lugs with no 5513 anywhere on the case, sits in the 5.339M cluster, and is the late, full-spec form of the program; Phillips estimates ~250 of these were produced and ~50 are recorded.
The program splits cleanly across three batches and two reference numbers. Batch 1 carries 5513 between the 12-o'clock lugs, runs in the early 3.9M serial cluster, and ships from c.1971-1974. Batch 2 keeps the 5513 lug engraving but adds a 5517 stamp under one lug — the so-called 5513/5517 double-reference watches — and clusters in the 3.926M band with issue years dominated by 1977 and 1979. Batch 3 carries 5517 between the 12-o'clock lugs with no 5513 anywhere on the case, sits in the 5.339M cluster, and is the late, full-spec form of the program; Phillips estimates ~250 of these were produced and ~50 are recorded.


This page covers the MilSub branch as a whole. The per-reference articles [[Reference:5513|Reference:5513]] and [[Reference:5517|Reference:5517]] carry the standard production detail; this page does not duplicate them.
Standard production detail for the base references sits on [[Reference:5513|5513]] and [[Reference:5517|5517]]. Everything below is specific to the military branch.


[[File:Milsub 5517 batch3-hero.webp|thumb|right|250px|alt=Rolex 5517 Military Submariner — Batch 3, case 5,339,705|Rolex 5517 "Full Spec" Military Submariner, Batch 3 (case 5,339,705, issue 853/78), maxi Mk I dial, encircled T, full 60-minute bezel, fixed-bar lugs. Sotheby's Important Watches Part I, Geneva, November 2023, lot 3.]]
[[File:Milsub 5517 batch3-hero.webp|thumb|right|250px|alt=Rolex 5517 Military Submariner — Batch 3, case 5,339,705|Rolex 5517 "Full Spec" Military Submariner, Batch 3 (case 5,339,705, issue 853/78), maxi Mk I dial, encircled T, full 60-minute bezel, fixed-bar lugs. Sotheby's Important Watches Part I, Geneva, November 2023, lot 3.]]
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The MilSub is one of two non-retail branches of the 5513 era, alongside the 5514 issued to French commercial diving company COMEX. The two sit in different worlds. COMEX 5514s were civilian-professional watches with a helium-escape valve, issued to a saturation-diving operator. MilSubs were military, issued by the British MoD, with a structural spec the retail line never carried: fixed bars, the full 60-minute bezel, sword hands.
The MilSub is one of two non-retail branches of the 5513 era, alongside the 5514 issued to French commercial diving company COMEX. The two sit in different worlds. COMEX 5514s were civilian-professional watches with a helium-escape valve, issued to a saturation-diving operator. MilSubs were military, issued by the British MoD, with a structural spec the retail line never carried: fixed bars, the full 60-minute bezel, sword hands.


The earliest documented British military issue of an Oyster diver is not the MilSub but the A/6538 SBS programme of 1957, roughly fifty examples of the Big Crown 6538 supplied to the Special Boat Service. The MilSub program proper begins around fifteen years later with the first batch of 5513-only military examples. By the time the dedicated 5517 batch arrives in 1978, the configuration has been formalised: full 60-minute bezel, sword hands, fixed bars, T SWISS T dial, dual caseback engraving.
British military issue of an Oyster diver starts well before the MilSub. The A/6538 program of 1957 put roughly fifty Big Crown 6538s into Special Boat Service hands. The MilSub proper follows about fifteen years later with the first batch of 5513-only military examples, and by the time the dedicated 5517 batch arrives in 1978 the configuration has hardened into its final form: full 60-minute bezel, sword hands, fixed bars, T SWISS T dial, dual caseback engraving.


The 5513 itself was widely fielded by other forces during this era — South African Army, Chilean Navy ("Propriedad Armada de Chile"), and a documented New Zealand Fisheries Research Division order of fourteen examples among them — but those were standard commercial 5513s procured through military channels, not MilSub-spec watches. They sit on the 5513 page rather than here.
The 5513 itself was widely fielded by other forces during this era — South African Army, Chilean Navy ("Propriedad Armada de Chile"), and a documented New Zealand Fisheries Research Division order of fourteen examples among them — but those were standard commercial 5513s procured through military channels, not MilSub-spec watches. They sit on the 5513 page rather than here.
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==Batch breakdown==
==Batch breakdown==


The cleanest taxonomy on the program is the three-batch split documented across major-house lots and traced through Phillips, Sotheby's, Antiquorum, and Bonhams catalogues. The defining cue is what is engraved between the 12-o'clock lugs.
The cleanest taxonomy on the program is the three-batch split that runs through the major-house catalogues. The defining cue is what is engraved between the 12-o'clock lugs.


===Batch 1: 5513 between the lugs (c.1971-1974)===
===Batch 1: 5513 between the lugs (c.1971-1974)===
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Batch 1 carries 5513 case markings between the 12-o'clock lugs — visually identical to a retail 5513 from outside the caseback. Production sits in the early 3.9M serial cluster. These earliest MilSubs are 5513 cases built to MoD spec rather than a separate reference family, and the engraving placement reflects the 5513 origin of the case.
Batch 1 carries 5513 case markings between the 12-o'clock lugs — visually identical to a retail 5513 from outside the caseback. Production sits in the early 3.9M serial cluster. These earliest MilSubs are 5513 cases built to MoD spec rather than a separate reference family, and the engraving placement reflects the 5513 origin of the case.


Batch 1 is the only batch where the configuration is not yet uniform. The Phillips and drsd.com record agrees that sword hands and the full 60-minute bezel were the factory spec from program inception, but a small number of Batch 1 5513s shipped with Mercedes hands and 0-15 hashed inserts. drsd.com's framing is that some Batch 1 5513 MilSubs delivered with either sword or Mercedes hands, while the 5517-only batch came only with sword hands and full 60-minute bezel. Most Mercedes-handed MilSubs surfacing today are service replacements, where MoD watchmakers swapped the oxidising sword set after long deployments.
Batch 1 is the only batch where the configuration is not yet uniform. Sword hands and the full 60-minute bezel were factory spec from program inception, but a small number of Batch 1 5513s shipped with Mercedes hands and 0-15 hashed inserts instead. The drsd.com military-Submariner pages read this as a Batch 1 split: early 5513 MilSubs delivered with either hand set, while the 5517-only batch came only with sword hands and the full 60-minute bezel. Most Mercedes-handed MilSubs surfacing today are service replacements, where MoD watchmakers swapped the oxidising sword set after long deployments.


===Batch 2: 5513/5517 double-reference (c.1972-1976)===
===Batch 2: 5513/5517 double-reference (c.1972-1976)===
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| est. CHF 150,000-300,000
| est. CHF 150,000-300,000
|}
|}
Phillips's reunited-pair article documents an authentication subtlety specific to the program: 5212xxx-band examples (issue 736-785) do not carry the serial inside the caseback, while 5339xxx-band examples do. The article also confirms that MoD watchmakers swapped casebacks during reissue cycles, which means a "non-matching" 5517 may still be entirely period-correct under the SAS / SBS reissue pattern. A matching caseback is not automatically more authentic than a non-matching one if the chain of custody documents the reissue.


==Configuration features==
==Configuration features==
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===Fixed bars===
===Fixed bars===


Friction-welded permanent spring bars, soldered into the lugs rather than fitted as removable spring bars. The strap cannot detach underwater if a bar fails. Universal across all three batches and a non-negotiable MoD spec from program inception. The bars are sized for NATO-style fabric pass-through; a MilSub will not take a standard Oyster bracelet without removing the fixed bars and refitting standard spring-bar lugs.
The bars are friction-welded permanently into the lugs instead of fitted as removable spring bars, so a strap cannot come free underwater if a bar fails. All three batches carry them, and the MoD required them from program inception. They are sized for NATO-style fabric pass-through; a MilSub will not take a standard Oyster bracelet without removing the fixed bars and refitting standard spring-bar lugs.


===60-minute bezel===
===60-minute bezel===


Minute gradations all the way around the bezel rather than only at the 0-15 dive interval. Minute-by-minute elapsed-time tracking for decompression. A Ministry of Defence requirement; the retail Submariner of the period uses the standard 0-15 hashed insert. The earliest 5513 MilSubs surface with both full-60 and 0-15 inserts; the 5517-only Batch 3 is uniformly full-60.
The insert is graduated minute by minute all the way around instead of only across the 0-15 dive interval, which gives minute-by-minute elapsed-time tracking for decompression. The Ministry of Defence required it; the retail Submariner of the period uses the standard 0-15 hashed insert. The earliest 5513 MilSubs surface with both full-60 and 0-15 inserts, and the 5517-only Batch 3 is uniformly full-60.


===Sword hands===
===Sword hands===


Wider and more sword-shaped than the standard Mercedes hand, also called "gladiator" or "plongeur" hands. Sword hands were factory spec across the whole MilSub program per the documented major-house catalogue language and the Phillips MilSub-discovery article. drsd.com qualifies the Batch 1 case: a small number of early 5513 MilSubs shipped with Mercedes hands. Mercedes-handed MilSubs in collector hands today are mostly service replacements where the oxidising sword set was swapped during reissue.
The sword hand is wider and more sword-shaped than the standard Mercedes hand, and collectors also call it the "gladiator" or "plongeur" hand. Major-house catalogue language and the Phillips MilSub-discovery article both put it as factory spec across the whole program, with the Batch 1 qualification noted above: a small number of early 5513 MilSubs shipped with Mercedes hands. Mercedes-handed MilSubs in collector hands today are mostly service replacements where the oxidising sword set was swapped during reissue.


===T SWISS T dial===
===T SWISS T dial===


Matte black, T SWISS T at the bottom of the dial in the dual-T format that flanks SWISS. Both T markers are required under UK regulations for tritium-lumed watches. The dial carries SUBMARINER and Rolex Oyster Perpetual above centre on most examples; most MilSub dials carry no depth rating in metric or imperial — the Ministry of Defence did not call for one. Late-program 5517 dials carry the same Maxi I (1976-1977) and Maxi II generations documented across the contemporary 5513.
The dial is matte black with T SWISS T at the bottom, the dual-T format that flanks the word SWISS. UK regulations for tritium-lumed watches required both T markers. SUBMARINER and Rolex Oyster Perpetual sit above centre on most examples, and most MilSub dials carry no depth rating in either metric or imperial, since the Ministry of Defence did not call for one. Late-program 5517 dials carry the same Maxi I (1976-1977) and Maxi II generations documented across the contemporary 5513.


===Caseback engraving===
===Caseback engraving===


The dual-engraving pattern splits maker and customer. Rolex reference and case-number markings sit on the inner caseback. Military identification — broad arrow, NATO stock numbers, service numbers — sits on the outer caseback. Royal Navy and SBS issue uses the 0552 prefix: ''0552 / 923-7697 / [issue]/[year]'' plus the broad arrow. Army, SAS, and W10 issue uses the W10 prefix: ''W10 / 6645 / 99 / 923-7697 / [issue]/[year]'' plus the broad arrow. The T-circle is a dial marking, not a caseback engraving — articles that describe it as caseback-side conflate two separate authentication tells.
The dual-engraving pattern splits maker and customer. Rolex reference and case-number markings sit on the inner caseback. Military identification — broad arrow, NATO stock numbers, service numbers — sits on the outer caseback. Royal Navy and SBS issue uses the 0552 prefix: ''0552 / 923-7697 / [issue]/[year]'' plus the broad arrow. Army, SAS, and W10 issue uses the W10 prefix: ''W10 / 6645 / 99 / 923-7697 / [issue]/[year]'' plus the broad arrow. The T-circle is a dial marking rather than a caseback engraving; descriptions that place it on the caseback conflate two separate authentication tells.


Documented issue numbers in major-house lots include 688/77, 691/77, 835/78, 842/78, 853/78, 941/79, 960/79, and 395/75. The broad arrow is the British government property mark; any broad-arrow watch in the civilian market either left service through official decommissioning or carries an unclear chain of custody. The mark is never a civilian or retail marking.
Documented issue numbers in major-house lots include 688/77, 691/77, 835/78, 842/78, 853/78, 941/79, 960/79, and 395/75. The broad arrow is the British government property mark; any broad-arrow watch in the civilian market either left service through official decommissioning or carries an unclear chain of custody. The mark is never a civilian or retail marking.
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==Authentication and faking patterns==
==Authentication and faking patterns==


The MilSub is one of the most faked Rolex references in the market. Three things combine to make it a fraud target: extreme value (consistently above USD 200,000 at auction for documented examples), a comparatively simple base watch (a modified 5513), and the difficulty of verifying military provenance against MoD records. The conversion path is short. A standard 5513 takes fixed bars, a 60-minute bezel, military caseback engravings, and sword hands. Each step is within reach of a skilled watchmaker, and the finished result can read visually convincing to anyone who has not handled a genuine example.
The MilSub is one of the most faked Rolex references in the market. Documented examples clear USD 200,000 at auction, the base watch is an ordinary 5513, and military provenance is hard to check against MoD records. The conversion path is short: a standard 5513 takes fixed bars, a 60-minute bezel, military caseback engravings, and sword hands. Each step is within reach of a skilled watchmaker, and the finished result reads convincingly to anyone who has not handled a genuine example.


A handful of documented patterns carry most of the authentication weight.
Most of the authentication weight rests on a few documented patterns. Phillips's MilSub-discovery article sets out the inside-caseback rule: 5212xxx examples (issue 736-785) do not carry the serial inside the caseback, while 5339xxx examples do. A 5339xxx case with no inside-caseback serial is wrong, and so is a 5212xxx case that has one. Working against that is the caseback-swap caveat. SAS and SBS operatives returned issued watches to stockroom after missions and casebacks moved between cases during reissue cycles, so a non-matching caseback can be entirely period-correct under documented MoD practice, and a matching one is not automatically the better watch where the chain of custody establishes reissue.


The first is the inside-caseback rule from Phillips's MilSub-discovery article: 5212xxx examples (issue 736-785) do not carry the serial inside the caseback, while 5339xxx examples do. A 5339xxx case with no inside-caseback serial is wrong; a 5212xxx case with one is also wrong. The second is the caseback-swap caveat. SAS and SBS operatives returned issued watches to stockroom after missions, and casebacks were swapped during reissue cycles. A non-matching caseback may be entirely period-correct under documented MoD practice; a matching caseback is not automatically more authentic if the chain of custody establishes reissue.
Some terminology is worth discounting outright. The "5513-T-MOD" and "5517-T-MOD" labels are collector slang for service-stripped MilSubs, meaning issue marks rubbed off, parts service-swapped, or never engraved in the first place. No registry-quality source treats T-MOD as a distinct taxonomic class. The three batches above are the cleaner taxonomy, with the standard 5513 and the COMEX 5514 sitting alongside as adjacent military-adjacent references.


The third pattern is the dealer-folklore terminology to discount. The "5513-T-MOD" and "5517-T-MOD" labels are collector slang for service-stripped MilSubs (issue marks rubbed off, parts service-swapped, or never engraved). No registry-quality source treats T-MOD as a distinct taxonomic class. The cleaner taxonomy is the three batches above plus the standard 5513 / 5514 COMEX as adjacent military-adjacent references.
Specialist documentation also notes a roughly EUR 20,000 value penalty for service-replaced bezels even when the replacement is period-correct. On otherwise genuine cases the documented fakery vectors are sword-hand replacement, dial relume, and "added T", where a non-T dial has the T markers printed on later. The strongest authentication ties provenance to a specific Royal Navy unit or service number, adds physical inspection by a specialist who can read fixed-bar construction and engraving depth, and cross-references the case against known examples. The genuine population is small enough that most of it is tracked.
 
Specialist documentation also notes a roughly EUR 20,000 value penalty for service-replaced bezels even when the replacement is period-correct. Sword-hand replacement, dial relume, and "added T" — where a non-T dial has the T markers added — are the documented fakery vectors on otherwise genuine cases. The most rigorous authentication chains documented provenance to a specific Royal Navy unit or service number, physical inspection by a specialist who can read fixed-bar construction and engraving depth, and cross-reference against known examples; the genuine population is small enough that most cases are tracked.


==Auction record==
==Auction record==
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The Phillips Geneva XIV 2021 result is the public auction record for the 5517 at CHF 504,000. The watch is a Batch 3 example in the 5,339,xxx cluster with a Henry Hudson letter from Rolex UK confirming issue to Her Majesty's Dockyard, Portsmouth in 1978. The result nearly tripled the high estimate of CHF 200,000, and that gap — between a specialist house's pre-sale read and what the room delivered — is itself the cleanest signal of how scarce a documented full-spec MilSub has become.
The Phillips Geneva XIV 2021 result is the public auction record for the 5517 at CHF 504,000. The watch is a Batch 3 example in the 5,339,xxx cluster with a Henry Hudson letter from Rolex UK confirming issue to Her Majesty's Dockyard, Portsmouth in 1978. The result nearly tripled the high estimate of CHF 200,000. Fully documented full-spec MilSubs come up rarely enough that the room priced well past what the house had read.


Batch 1 5513-only MilSubs trade lower than the headline numbers because of the more frequent service-component drift on early examples and the difficulty of separating an honest Batch 1 from a converted retail 5513. The cleanest Batch 1 lots still pull six figures when the chain of custody and the configuration both hold up; the spread is wider than it is on Batch 3.
Batch 1 5513-only MilSubs trade lower than the headline numbers because of the more frequent service-component drift on early examples and the difficulty of separating an honest Batch 1 from a converted retail 5513. The cleanest Batch 1 lots still pull six figures when the chain of custody and the configuration both hold up; the spread is wider than it is on Batch 3.


==Sources==
 
== Related references ==
 
* [[Reference:submariner|Submariner family index]]
* [[Reference:5513|Submariner 5513]] — the base reference for most MilSubs
* [[Reference:5517|Submariner 5517]] — the dedicated military-issue reference
* [[Reference:5512|Submariner 5512]] — early crown-guard MilSub base
* [[Reference:6538|Submariner 6538]] — the A/6538 Special Boat Service precursor
 
== Sources ==


* ''The Vintage Rolex Field Manual'' — Colin A. White, Morning Tundra
* ''The Vintage Rolex Field Manual'' — Colin A. White, Morning Tundra

Latest revision as of 21:11, 9 August 2026


Submariner -> MilSub

The MilSub is the British military Submariner: a Rolex Submariner 5513 or 5517 case configured to Ministry of Defence specification and issued, in batches between roughly 1971 and 1979, to Royal Navy divers (the 0552 / 923-7697 line) and to British Army units including the SAS and Army Air Corps (the W10 line). The name describes a configuration rather than a reference family. A Submariner earns it by carrying fixed bars in the lugs, a fully graduated 60-minute bezel, sword hands, a T SWISS T tritium dial, and the broad-arrow caseback engraving that marks British Crown property.

The program splits cleanly across three batches and two reference numbers. Batch 1 carries 5513 between the 12-o'clock lugs, runs in the early 3.9M serial cluster, and ships from c.1971-1974. Batch 2 keeps the 5513 lug engraving but adds a 5517 stamp under one lug — the so-called 5513/5517 double-reference watches — and clusters in the 3.926M band with issue years dominated by 1977 and 1979. Batch 3 carries 5517 between the 12-o'clock lugs with no 5513 anywhere on the case, sits in the 5.339M cluster, and is the late, full-spec form of the program; Phillips estimates ~250 of these were produced and ~50 are recorded.

Standard production detail for the base references sits on 5513 and 5517. Everything below is specific to the military branch.

Rolex 5517 Military Submariner — Batch 3, case 5,339,705
Rolex 5517 "Full Spec" Military Submariner, Batch 3 (case 5,339,705, issue 853/78), maxi Mk I dial, encircled T, full 60-minute bezel, fixed-bar lugs. Sotheby's Important Watches Part I, Geneva, November 2023, lot 3.

Core facts

detail value
references Submariner 5513 and 5517
program window c.1971-1979
issued to Royal Navy (0552 line) and British Army incl. SAS / Army Air Corps (W10 line); never retailed
batches three: Batch 1 (5513 only), Batch 2 (5513/5517 double-reference), Batch 3 (5517 only)
total program the 5517-only Batch 3 estimated at ~250 produced / ~50 known per Phillips
dial T SWISS T (tritium); most examples carry no depth rating
hands sword (also called "gladiator" or "plongeur"); a small number of Batch 1 5513s shipped with Mercedes hands
bezel fully graduated 60-minute insert (not the retail 0-15 hashed insert)
case fixed spring bars friction-welded into the lugs
caseback dual-engraving: Rolex case markings inside, military markings outside (broad arrow + NATO stock + issue/year)
movement caliber 1520 across all three batches per documented major-house lots

Where it sits in the line

The MilSub is one of two non-retail branches of the 5513 era, alongside the 5514 issued to French commercial diving company COMEX. The two sit in different worlds. COMEX 5514s were civilian-professional watches with a helium-escape valve, issued to a saturation-diving operator. MilSubs were military, issued by the British MoD, with a structural spec the retail line never carried: fixed bars, the full 60-minute bezel, sword hands.

British military issue of an Oyster diver starts well before the MilSub. The A/6538 program of 1957 put roughly fifty Big Crown 6538s into Special Boat Service hands. The MilSub proper follows about fifteen years later with the first batch of 5513-only military examples, and by the time the dedicated 5517 batch arrives in 1978 the configuration has hardened into its final form: full 60-minute bezel, sword hands, fixed bars, T SWISS T dial, dual caseback engraving.

The 5513 itself was widely fielded by other forces during this era — South African Army, Chilean Navy ("Propriedad Armada de Chile"), and a documented New Zealand Fisheries Research Division order of fourteen examples among them — but those were standard commercial 5513s procured through military channels, not MilSub-spec watches. They sit on the 5513 page rather than here.

Batch breakdown

The cleanest taxonomy on the program is the three-batch split that runs through the major-house catalogues. The defining cue is what is engraved between the 12-o'clock lugs.

Batch 1: 5513 between the lugs (c.1971-1974)

Batch 1 carries 5513 case markings between the 12-o'clock lugs — visually identical to a retail 5513 from outside the caseback. Production sits in the early 3.9M serial cluster. These earliest MilSubs are 5513 cases built to MoD spec rather than a separate reference family, and the engraving placement reflects the 5513 origin of the case.

Batch 1 is the only batch where the configuration is not yet uniform. Sword hands and the full 60-minute bezel were factory spec from program inception, but a small number of Batch 1 5513s shipped with Mercedes hands and 0-15 hashed inserts instead. The drsd.com military-Submariner pages read this as a Batch 1 split: early 5513 MilSubs delivered with either hand set, while the 5517-only batch came only with sword hands and the full 60-minute bezel. Most Mercedes-handed MilSubs surfacing today are service replacements, where MoD watchmakers swapped the oxidising sword set after long deployments.

Batch 2: 5513/5517 double-reference (c.1972-1976)

Batch 2 keeps 5513 between the 12-o'clock lugs and adds a 5517 stamp under one lug, conventionally the 7-o'clock lug. The dual marking captures the program's transition from repurposed 5513 cases to dedicated 5517 production. Documented examples cluster in the 3.926M serial band:

Auction Date Case Year Issue Caseback line Hammer
Phillips New York "Game Changers" lot 28 2019 3,926,768 c.1972 688/77 0552 (Royal Navy) USD 218,750
Phillips Hong Kong lot 807 2017 3,926,923 c.1974 941/79 W10 (Army) HK$ 1,625,000
Antiquorum Monaco lot 77 2022 3,926,842 c.1975 960/79 W10 EUR 260,000
Sotheby's Geneva lot 64 2023 3,926,898 c.1973 — — —
Bonhams 2018 lot 90 2018 392xxxx c.1972 engravings removed inner caseback I.72 GBP 72,500 incl. premium
Bonhams Knightsbridge 2022 — c.1975 691/77 RN diver provenance GBP 195,600 incl. premium

Issue years 77 and 79 dominate the cluster. The case-number band is unusually tight for a ~five-year production window; the cleanest reading is that MoD procurement was batched against a small contemporaneous slice of 5513 cases rather than spread evenly through the run.

Batch 3: 5517 only (c.1978)

Batch 3 carries 5517 between the 12-o'clock lugs with no 5513 anywhere on the case — the full-spec form of the reference. Production sits in the 5.339M cluster, and every documented Batch 3 issue year is 78. Phillips's MilSub-discovery article gives the only batch-specific population figure: ~250 produced, ~50 recorded.

Auction Date Case Year Issue Caseback line Hammer
Phillips Geneva XIV lot 152 2021 5,339,827 c.1978 842/78 0552 RN CHF 504,000
Sotheby's Important Watches I lot 3 2023 5,339,705 c.1978 853/78 0552 RN est. CHF 120,000-180,000
Phillips MilSub-discovery (reunited pair) n/a 5,339,667 c.1978 835/78 0552 RN n/a (article)
Sotheby's New York lot 238 2018 — c.1978 — MOD engravings est. CHF 150,000-300,000

Configuration features

Sword hands and Maxi Mk I dial close-up
Sword hands, Maxi Mk I dial with encircled T, and full 60-minute calibrated bezel — the three diagnostic features collectors look for.
Full 60-minute calibrated bezel insert
Full 60-minute calibrated insert — every minute graduated, the MoD requirement that distinguishes a MilSub bezel from a civilian 5513.
Encircled T below 6 o'clock
Encircled T below 6 o'clock indicating MoD-spec low-radiation tritium — distinct from civilian "T<25" dials of the period.
Fixed-bar lug profile
Fixed-bar lugs: spring-bars welded into the case to keep the strap from working free during operations. Sotheby's Important Watches, December 2023, lot 64.

The MilSub is defined by a small set of mandated features, each of which appears on no retail Submariner of the period. Every documented Batch 3 5517 carries all of them; Batch 1 5513s drift on a subset.

Fixed bars

The bars are friction-welded permanently into the lugs instead of fitted as removable spring bars, so a strap cannot come free underwater if a bar fails. All three batches carry them, and the MoD required them from program inception. They are sized for NATO-style fabric pass-through; a MilSub will not take a standard Oyster bracelet without removing the fixed bars and refitting standard spring-bar lugs.

60-minute bezel

The insert is graduated minute by minute all the way around instead of only across the 0-15 dive interval, which gives minute-by-minute elapsed-time tracking for decompression. The Ministry of Defence required it; the retail Submariner of the period uses the standard 0-15 hashed insert. The earliest 5513 MilSubs surface with both full-60 and 0-15 inserts, and the 5517-only Batch 3 is uniformly full-60.

Sword hands

The sword hand is wider and more sword-shaped than the standard Mercedes hand, and collectors also call it the "gladiator" or "plongeur" hand. Major-house catalogue language and the Phillips MilSub-discovery article both put it as factory spec across the whole program, with the Batch 1 qualification noted above: a small number of early 5513 MilSubs shipped with Mercedes hands. Mercedes-handed MilSubs in collector hands today are mostly service replacements where the oxidising sword set was swapped during reissue.

T SWISS T dial

The dial is matte black with T SWISS T at the bottom, the dual-T format that flanks the word SWISS. UK regulations for tritium-lumed watches required both T markers. SUBMARINER and Rolex Oyster Perpetual sit above centre on most examples, and most MilSub dials carry no depth rating in either metric or imperial, since the Ministry of Defence did not call for one. Late-program 5517 dials carry the same Maxi I (1976-1977) and Maxi II generations documented across the contemporary 5513.

Caseback engraving

The dual-engraving pattern splits maker and customer. Rolex reference and case-number markings sit on the inner caseback. Military identification — broad arrow, NATO stock numbers, service numbers — sits on the outer caseback. Royal Navy and SBS issue uses the 0552 prefix: 0552 / 923-7697 / [issue]/[year] plus the broad arrow. Army, SAS, and W10 issue uses the W10 prefix: W10 / 6645 / 99 / 923-7697 / [issue]/[year] plus the broad arrow. The T-circle is a dial marking rather than a caseback engraving; descriptions that place it on the caseback conflate two separate authentication tells.

Documented issue numbers in major-house lots include 688/77, 691/77, 835/78, 842/78, 853/78, 941/79, 960/79, and 395/75. The broad arrow is the British government property mark; any broad-arrow watch in the civilian market either left service through official decommissioning or carries an unclear chain of custody. The mark is never a civilian or retail marking.

Movement

Caseback removed showing inside-case stamping and caliber 1520
Caseback removed showing the inside-case stamping (5,339,705) and caliber 1520 movement.


The MilSub runs caliber 1520 across all three batches. Every Phillips, Sotheby's, Antiquorum, and Bonhams lot description for a documented MilSub reads cal. 1520 at 26 jewels. The forum-level claim that some 5517 examples carry caliber 1570 is not supported by any major-house lot in documented examples, and it likely shows contamination from standard 5512 / 5513 cases that can house either caliber. The MilSub's distinction over the standard 5513 is structural — fixed bars, 60-minute bezel, sword hands, military caseback engravings — not mechanical.

Bracelet, strap, and packaging

Issued watches were delivered on NATO-style fabric straps rather than metal bracelets, in keeping with the fixed-bar design. The bars do not take a standard Oyster bracelet, and the NATO pass-through is deliberate: the strap continues beneath the watch even if one bar fails, so the watch stays on the wrist. Packaging followed procurement logistics rather than retail presentation — military stores packaging, not standard Rolex retail boxes.

Authentication and faking patterns

The MilSub is one of the most faked Rolex references in the market. Documented examples clear USD 200,000 at auction, the base watch is an ordinary 5513, and military provenance is hard to check against MoD records. The conversion path is short: a standard 5513 takes fixed bars, a 60-minute bezel, military caseback engravings, and sword hands. Each step is within reach of a skilled watchmaker, and the finished result reads convincingly to anyone who has not handled a genuine example.

Most of the authentication weight rests on a few documented patterns. Phillips's MilSub-discovery article sets out the inside-caseback rule: 5212xxx examples (issue 736-785) do not carry the serial inside the caseback, while 5339xxx examples do. A 5339xxx case with no inside-caseback serial is wrong, and so is a 5212xxx case that has one. Working against that is the caseback-swap caveat. SAS and SBS operatives returned issued watches to stockroom after missions and casebacks moved between cases during reissue cycles, so a non-matching caseback can be entirely period-correct under documented MoD practice, and a matching one is not automatically the better watch where the chain of custody establishes reissue.

Some terminology is worth discounting outright. The "5513-T-MOD" and "5517-T-MOD" labels are collector slang for service-stripped MilSubs, meaning issue marks rubbed off, parts service-swapped, or never engraved in the first place. No registry-quality source treats T-MOD as a distinct taxonomic class. The three batches above are the cleaner taxonomy, with the standard 5513 and the COMEX 5514 sitting alongside as adjacent military-adjacent references.

Specialist documentation also notes a roughly EUR 20,000 value penalty for service-replaced bezels even when the replacement is period-correct. On otherwise genuine cases the documented fakery vectors are sword-hand replacement, dial relume, and "added T", where a non-T dial has the T markers printed on later. The strongest authentication ties provenance to a specific Royal Navy unit or service number, adds physical inspection by a specialist who can read fixed-bar construction and engraving depth, and cross-references the case against known examples. The genuine population is small enough that most of it is tracked.

Auction record

Double-reference 5513/5517 with maxi Mk I dial and pumpkin patina
A 5513/5517 double-reference example (case 3,926,898, c.1973) showing maxi Mk I dial with pumpkin patina. Sotheby's Important Watches, December 2023, lot 64.


Documented MilSub results sort cleanly by batch. Batch 3 full-spec 5517s set the top of the market. Batch 2 5513/5517 double-reference watches cluster in a wide band depending on configuration and provenance. Service-stripped or removed-engraving examples trade lower.

Auction Lot Year Case Configuration Hammer
Phillips Geneva XIV 152 2021 5,339,827 Batch 3 5517, c.1978, 0552 RN issue 842/78 CHF 504,000
Sotheby's Important Watches I 3 2023 5,339,705 Batch 3 5517, c.1978, 0552 RN issue 853/78, Maxi I est. CHF 120,000-180,000
Antiquorum Monaco 77 2022 3,926,842 Batch 2 5513/5517, c.1975, W10 issue 960/79 EUR 260,000
Phillips New York "Game Changers" 28 2019 3,926,768 Batch 2 5513/5517, c.1972, 0552 RN issue 688/77 USD 218,750
Bonhams Knightsbridge — 2022 — Batch 2 5513/5517, c.1975, original RN diver provenance, caseback 691/77 GBP 195,600 incl. premium
Phillips Hong Kong 807 2017 3,926,923 Batch 2 5513/5517, c.1974, W10 Army issue 941/79 HK$ 1,625,000
Fellows Birmingham 129 2020 — 5517 with MOD engravings GBP 174,800 incl. premium (Fellows house record)
Sotheby's New York 238 2018 — 5517 c.1978, MOD engravings, Rolex presentation case est. CHF 150,000-300,000
Bonhams London Fine Watches 90 2018 392xxxx Batch 2 5513/5517, c.1972, military engravings removed, inner caseback I.72 GBP 72,500 incl. premium
Sotheby's — 2020 — 5513 South African Army-associated, c.1970 (5513 commercial; not a MilSub)

The Phillips Geneva XIV 2021 result is the public auction record for the 5517 at CHF 504,000. The watch is a Batch 3 example in the 5,339,xxx cluster with a Henry Hudson letter from Rolex UK confirming issue to Her Majesty's Dockyard, Portsmouth in 1978. The result nearly tripled the high estimate of CHF 200,000. Fully documented full-spec MilSubs come up rarely enough that the room priced well past what the house had read.

Batch 1 5513-only MilSubs trade lower than the headline numbers because of the more frequent service-component drift on early examples and the difficulty of separating an honest Batch 1 from a converted retail 5513. The cleanest Batch 1 lots still pull six figures when the chain of custody and the configuration both hold up; the spread is wider than it is on Batch 3.


Related references

Sources

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