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The Rolex “MilSub” Submariner Ref. 5517

January 7, 2019

BY Andy Callan


The world of vintage Rolex has developed its own unofficial language over the years, with certain words or phrases being coined to describe various, usually highly desirable, pieces among collectors. Throwing around names like “Blueberry” or “Double Red” at a meet up is generally enough to see every eye in the room light up. But perhaps above all others, and especially for those enamored of the most famous dive watch of all time, is the term “MilSub.”


A reference 5513 “MilSub” Submariner with an international service guarantee from Rolex.

A compound of the words “Military” and “Submariner,” it describes any of the four different references that were modified to meet the requirements of the British Armed Forces, going back as far as 1957. That was the year the Ministry of Defense (MOD) came knocking on Rolex’s door, looking for a timepiece reliable and sturdy enough to become standard-issue for the Royal Navy’s relatively new division of underwater combatants. They were furnished with about 50 off-the-shelf examples of the reference 6538, more commonly known as one of the “Big Crown” Submariner references, or alternatively, the “Bond Sub” for its time on Connery’s arm during Dr. No.

After extensive field testing, the MOD brought the watches back, asking for just some minor adjustments. Firstly, a redesign of the bezel to make it easier for divers to grip while wearing gloves. Rolex increased the diameter of the bezel so that it hung over the sides of the case, and changed the coin-style edging to the serrated design we know today. They also constructed it from nickel silver instead of plated brass to make it less susceptible to corrosion and cracking under impact. The other main revision was to swap the standard spring bars with soldered bars between the lugs to hold the NATO strap. The changes were so slight they did not even warrant an entirely new reference number; the customized military watch was christened the A/6538.

The first MilSub served with distinction until 1967, when the Royal Navy switched allegiances and opted instead for Omega’s reworked Seamaster 300. However, the limitations of its Naiad winding crown at shallow depths brought the MOD back to Rolex just four years later in 1971.


A reference 6538 Rolex “Big Crown” Submariner.

The Rolex MilSub ref. 5517

By 1971, the Submariner had graduated to a more modern iteration with the ref. 5512 (COSC-certified) and ref. 5513 (non-chronometer). Between 1971 and 1979, British Special Forces would take delivery of around 1,200 pieces, split across three references based on the 5513. Practically identical, they all incorporated the design changes first seen on the A/6538, along with a couple of further tweaks.

The bezel, now made of stainless steel, included hash marks on its aluminum insert that continued round for the full 60-minutes rather than just the first 15, as on the commercially available Submariner. The handset was switched on most from the trademark “Mercedes-style” to a pair of large “sword” or “gladiator” hands, and a seconds hand with an arrow-shaped tip. Additionally, unlike virtually every civilian Rolex, the case backs were engraved – those destined for the Special Boat Service (SBS) designated with “0552” before their individual ID number, their counterparts for the SAS marked with “W10.”


Unlike the vast majority of Rolex watches that are sold to the public, MilSubs have engravings on their casebacks.

In addition, they retained a special symbol on the dial carried over from the initial MilSub from the 50s. A small letter ‘T’ in a circle above the six o’clock denoted that the original, and highly dangerous, radium lume used on hands and indexes had been stripped by MOD subcontractor Burford, and replaced with the much safer Tritium. It is one of those tiny details that is oh so important when looking at vintage Rolex.


The ref. 5517 MilSub has a number of unique characteristics that set it apart from other Rolex Submariner references.

The real difference between the last three MilSubs is based on their dates of release. The early 70s saw the 5513 reference used, followed by models issued as 5513/5517, which are known as double stamped. The final piece is the most coveted of all Submariners, with the possible exception of the COMEX ref. 5514 with its retrofitted helium gas escape valve.

The ref. 5517 is the only reference with no civilian equivalent. Although in reality it is not a particularly heavily-modified 5513, the fact it has a unique number, and a backstory very few watches can match, make it among the most grail-like pieces in the Submariner canon. Issued only to the military, every example of the 5517 came with broad arrow hands and, while prices for authentic models have always been high, they have recently crossed over into the astronomic. The premiums are based on a few other factors too, rarity value being among the most important. Of the approximately 1,200 or so MilSubs, only around 180 are still in circulation. That is 180 over all three examples from the 70s. With Special Forces soldiers not famous for taking it easy on their kit, most of the watches have been either lost or destroyed.

That hardworking nature is another reason there are so few surviving pieces in their original condition. As it is vital for all military equipment to be in perfect working order, MilSubs were sent in for servicing far more frequently than normal, leading to replacement parts being used – especially the handset. The large surface area of the sword hands led to peeling and oxidation, and many were swapped for new ones. A completely unadulterated 5517 is almost unheard of, and when one surfaces, bank managers tend to get nervous.

Starting points in six figures are to be expected, and can climb a long way north of that. Of course, as more time passes and even fewer pieces are available for sale, buying into the MilSub club will only get more and more expensive.


Rolex MiSubs cannot be worn on a bracelet due to the fixed bars that are welded onto the lugs.

The MilSub Dilemma

Anyone familiar with collecting vintage watches, and Rolex in particular, will have identified the problem with the ref. 5517 straight away. The Submariner is already, by far, the most counterfeited luxury watch in the world. The temptation for miscreants and ne’er-do-wells to take a standard Sub and convert it to look like one of these ultra-rare examples, and add a zero or two onto the asking price, has proven too great to resist in recent times.

No MilSub, especially the 5517, should ever be an impulse buy, but rather one that comes at the end of some long, exhaustive research on both the watch and the seller. There are a host of details to be on the lookout for and becoming an expert is the only way of ensuring you don’t make a very costly mistake. It is obviously a whole load of extra effort, but then A, you are dealing with an extra special watch. Whereas any MilSub is exceptional, the ref. 5517 is the preferred choice of the world’s most elite fighting forces, and with remaining numbers of barely a handful, it is in a class of its own.



3 Responses to “The Rolex “MilSub” Submariner Ref. 5517”

  1. Eric says:

    Hi, i do have one of those watch you’re talking about this ref 5517 printed w10! One question though: are all 5517 printed W10?
    I have also the letter from Rolex and one from the soldier who had it!
    And you say there would be only 180 remaining, how many do you think 5517 remain today?
    Thank you for your answer,

    • Paul Altieri says:

      Amazing watch, especially considering that you still have the accompanying paperwork! The W10 marking corresponds to the branch to which it was issued (army), so you will also find examples marked with “0552” (navy) in the same place on the case-back.
      The approximate 180 examples in circulation are only those that have surfaced. It is virtually a guarantee that the majority of the 1,200 or so examples that were originally issued are no longer in existence today, but the exact number of ref. 5517 watches remaining will almost always remain unconfirmed. There is always the possibility that some individuals out there still have the ones that they were issued back in the day, and that they are simply sitting at the bottom of a drawer or in a box, waiting to be discovered.

  2. thenotoriousrob says:

    When you tire of the watch Eric, feel free to email me (gmail) with username here. Been looking for one of these for a long time. Paul, you as well… trying not to pay the commission from the auction houses. Rob

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