The Mystery of the Rolex GMT Master II 16710-3186

The Mystery of the Rolex GMT Master II 16710-3186

Nov 08

The Mystery of the Rolex GMT Master II 16710-3186
By: John B. Holbrook, II
June12th, 2008

In recent months, I’ve been seeing reports online regarding some interesting variations on the GMT Master II 16710 (for more information on the GMT Master II, click HERE) which have been showing up at dealers, in the last remaining number of models which exist.  For those not aware, Rolex officially confirmed at the 2007 Basel fair that production was ending on the 16710, as it was being replaced by the 1167X line of ceramic bezel GMT Master II watches (click HERE for additional information).  Specifically, these final watches at the end of the production run for the 16710 not only exhibited a dial font variation (specifically in the “II” where “GMT Master II” was printed on the dial, but also had a surprise in the movement used in these watches.  Last week my Rolex authorized dealer called me and told me about an interesting GMT Master II which they’d just gotten in, and that their Rolex rep actually wanted to buy the watch for himself, saying that very few had been produced.  The dealer told the Rolex Rep they had a customer they knew who would want the watch, and immediately called me.  Here’s a few photos of the watch, which is an M serial and according to Rolex is the last production serial for the 16710 GMT Master II:

Notice the lack of the new “RolexRolexRolex” engraving on the rehaut – an indication that they’re exhausting existing supply inventories and key to a point I will make below.:

Cursory examination of this watch shows it to be in most respects virtually identical to any other 16710.  However, let’s more closely examine the dial, and compare it to a previous 16710 I’ve owned.  Here’s a close up photo of a Y series production 16710 I previously owned – note in the words “GMT Master II” the II is written in Roman numerals:

Now take a look at a close up of the dial on the new M serial I just purchased, and compare it to the above photo. The font used for the “II” in GMT Master II is different, and not like standard Roman numerals.  Collectors have been calling these “sticks” vs. traditional “Romans” as was used in previous iterations of the GMT Master II.

The small but significant dial font variation is not the only different between this watch and a standard 16710 GMT Master II of the past.  Opening the watch case, I would expect to find the venerable Rolex caliber 3185 which has been used in the 16710 for roughly two decades.  Instead, here are some photos showing the movement I found in this GMT Master II:

This watch has the newer Rolex Caliber 3186 inside – the same movement used in the Rolex GMT Master 1167X line which replaces the 1670.  This is fairly significant as, to date, Rolex has not produced a classic “Pepsi” red and blue color bezel for the new 1167X line – apparently they are having difficulty getting the pigment colors to blend properly with the ceramic used in these new bezels which is why only black ceramic has been used to date.  But the “Pepsi” bezel has been available on the GMT Master II beginning with the watches introduction from the 1950’s.  Fans of the GMT Master II have really been disappointed that they beloved “Pepsi” bezel GMT 16710 was being discontinued and MANY fans have clamored for a “Pepsi” bezel GMT Master II which had the newer and superior, caliber 3186 (fitted with the new Rolex Parachrom Bleu hairspring).  Well, I can confirm that a limited number of these watches do exist.  Here’s some additional shots of the new hairspring on the 3186:

Are these watches “errors” from the Rolex factory? I don’t believe they are.  Rumors in the online community have persisted that these models which left the Rolex factory had a dial misprint and were mistakenly fitted with the caliber 3186 inside.  I do not believe this to be the case.  The first point of evidence which would seem to dispel the myth that the 3186 equipped 16710 GMT Master II’s represent a factory error is the fact that examples of the Explorer II from roughly the same production period also have the caliber 3186 inside.    Note that the Explorer II has not, as of yet, been discontinued though it is expected that Rolex will soon announce a replacement for the current Explorer II in much the same fashion as the GMT Master II.  I spoke to some contacts I have at Rolex USA as well as some service technicians that I know who work at Rolex Authorized dealers on this point, and confirmed that the 3186 inside the 16710 GMT’s was no accident, however they had no idea that Geneva had shipped these 16710 examples with the 3186 inside.  Initial indications are that the lion’s share of these models went to the USA, with some know examples showing up in HK.

If the 16710B doesn’t represent a production error from Rolex, what happened? Certainly these aren’t errors from the Rolex factory, and I wouldn’t call these variant models “transitional models” such as we’ve seen with the Submariners from the late 1980’s.  My unconfirmed theory is that Rolex pulled the caliber 3185 out of production, once the 3186 came along (any surplus movements and parts have likely has been “mothballed” in order to service and maintain the large global population of caliber 3185 equipped watches which exist).  Rolex probably had more bezels and cases left over than available 3185 movements, and decided to put the caliber 3186 inside them and sell them until the cases and bezels ran out.

Is the presence of “sticks” instead of “Romans” on the dial a guarantee of the watch having a caliber 3186 inside? Unfortunately, no.  The way Rolex does things just doesn’t make it easy for collectors.  Examples of the stick dial GMT Master IIs have been reported as far back as the Y series of production – roughly five years ago, and well before the 3186 went into production.  Since there are examples of both stick and Roman dials from the Y series, I believe that to be the production series in which Rolex began phasing in the stick dial GMTs.  It would appear that the only reliable way to confirm the presence of a caliber 3186 in a 16710 is to open the case and visually inspect the movement.  Early reports suggest the 16710B began toward the end of the Z production, and continue through the end of the M production serial.

The model/style number on the newer warranty certificates has an alpha code next the model number.  Doesn’t that confirm that the watch has a 3186 inside? I initially thought the answer to this question was yes.  Take a look at the below scan of the new “credit card” style warranty and chronometer certificate I received with this watch.  Note the “Style number” is expressed 16710B.

I thought “Aha!  The “B” must designate that this 16710 is different than any other and has the 3186.  But after seen a lot of online discussion forum posts, emails, and phone calls I found out I was in error on this point.  It has been confirmed that the “B” in 16710B actually refers to the watch as having the red and blue “Pepsi” bezel insert.  Here’s the photo of a friend’s watch which came from a US AD that has the wine/black bezel insert, and shows that the style number is expressed “16710A” with the “A” denoting the wine/black bezel insert.

Apparently, an all -black bezel 16710 will have the designation “16710N.”  The confusing part about this is that Rolex USA has to my knowledge never used any naming scheme to differentiate the bezel choices on the 16710.  Take a look at this quick snapshot from a 2002 catalog/brochure produced by Rolex USA which clearly shows the wine/black bezel 16710 as simply the “16710:

To add to the confusion, further research points to support the notion that Rolex Geneva never handed down a consistent naming scheme for the 16710 to their international points of distribution – they left to “do their own thing.”  You can see above what Rolex USA did, and here’s a snapshot of a German Rolex catalog which shows how the 16710 naming convention differs from Rolex USA:

So since no other naming convention exists for the 16710 equipped with the caliber 3186, I refer to these models as the 16710-3186.

Are the 16710-3186 GMTs “rare collectibles” with potential for price appreciation? Magic 8 ball says yes.  History will be the ultimate decision maker here, but one can speculate how many (few?) exist.  Rolex doesn’t publish production figures, but the COSC institute does publish how many COSC certificates it issues for Rolex – usually around 600,000 per year, give or take.  The 16710-3186 production seems to have run from about the end of the Z production, through the end of the next production series, M (or until Rolex ran out of cases and bezels at some point during M production).  I’d guess 16710-3186 production represents no more than between 2% to perhaps as much as 5% of the total production during this period (let’s say 700,000).  So I’m guessing that no more than 35,000 examples of the 16710-3186 exist globally, and quite likely far less.  That’s an extremely small production run by modern Rolex standards.  And Rolex isn’t making any more of them.  Whatever the exact number, you can be sure there are far fewer 16710-3186 GMTs out there than stainless Daytonas.  And we all know how collectible they are.

You can discuss this article in the Rolex Forum of my online luxury watch discussion forum community WATCH TALK FORUMS.

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  1. manos

    Hallo John,
    I own one of them, purchased in Hong Kong with serial Z986XXX and Roman II.
    It has 3186 mechanism.Is it rare?

    • jbhii

      If you are certain it has a 3186 inside (don’t trust “wiggle tests – open the case back to verify the movement) then yes – it’s rare. I’d love to see some photos of it over in the Rolex Forum of my other site in the Rolex Forum – I’ve never seen a 16710-3186 with a Roman II dial.

  2. Anders

    Hi John! Nice write-up. It’s interesting to see the picture from the German Rolex catalogue, as it displays all three 16710 bezel variations and also the suggested names BLRO, [blank] and LN. It’s a Rolex-published catalogue, isn’t it? (Not an AD’s?) Would you know in what year it was published? In the standard, less complete catalogues there was usually only one 16710 variation listed I think.
    Thx and best regards

    • John B. Holbrook, II

      Hi Anders – yes, I believe it is a Rolex published catalog from the same year the article was written in I believe.

  3. Robert S

    I am willing to pay alot more for any error dial ,but i still cant find one. They are very rare. With or without the movement, you just cant seem to find them. I have several friends who are collectors and they all said if they ever see one they would snap it up in a second, but that they never come across them.

    • John B. Holbrook, II

      Error dials are difficult to find – though to be clear, the 16710-3186 isn’t an error dial.

  4. Josh

    Ive been looking for an error dial for two years and still cant find one. I was even willing to trade my brand new submariner for one. Why the heck are these, so darn rare? Im still looking and maybe someday i will find one.

  5. Jim

    Ive been searching for years for an error dial, with no luck. At one point i was even will to pay 9k for one. Ive all but given up on ever finding one. Im thinking only a handfull were ever made.

  6. Paul K

    Ive been searching forever,for the error dial pepsi and still cant find one. I saw one in a jewlery store 3 years ago for 8,700 and knew i should have bought it. When i went back 2 days later it was gone. A collector from vermont got it.

  7. Matthias

    Dear John,
    Thanks for this write-up and documentation on the various dials of the 16710. As you mentioned, the stick-dial is not an error-dial, nor the rectangular dial. They are just different fonts used over different era’s. The stick-dial goes back as far as 2005 in D-Serials. The rectangular was used towards the end of the production in Late Z-Serials and early M-Serials. The 3186 caliber is a nice upgrade in the 16710, but I doubt that over the coming years it will fetch a higher premium. I hope you are right, but I doubt it.
    Thanks again for your great site! I enjoy it every time I visit.

  8. Rick tapping

    I have a 2003 GMT MASTER II with black bezel and dial with the green arm and writing is this rare as all others I’ve seen have red writing

  9. John B. Holbrook, II


  10. JV

    Interesting read, thanks!

    Purchased a second hand but mint GMT a few months back and turns out I have the 2 sticks (||) and not the (II).


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