Reference:MilSub

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). 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 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 and Reference:5517 carry the standard production detail; this page does not duplicate them.

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.

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.

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 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.

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. 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 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

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

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

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.

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.

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.

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.

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.

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

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. 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.

A handful of documented patterns carry most of the authentication weight.

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.

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. 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

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, 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.

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