Rolex · GMT-Master II
Rolex GMT-Master II 126710GRNR: specifications and what to check
Calibre 3285 with an independently rapid-setting hour hand, on a Jubilee bracelet, under a two-colour grey and black Cerachrom insert. The suffix in the reference is the bezel, and it is how you identify what you are being offered.
Reference 126710GRNR · specifications read from the manufacturer on 2026-09-22 · listed as current
Specifications
As published by Rolex. A field the manufacturer does not state is left out rather than filled in.
- Case
- Oyster, 40 mm, Oystersteel. Monobloc middle case, screw-down case back and winding crown
- Diameter
- 40 mm
- Water resistance
- Waterproof to 100 metres / 330 feet
- Crystal
- Scratch-resistant sapphire
- Bezel
- Bidirectional rotatable 24-hour graduated bezel, two-colour grey and black Cerachrom insert in ceramic, moulded numerals and graduations
- Dial
- Black, with highly legible Chromalight display with long-lasting blue luminescence
- Case back
- Screw-down
- Crown
- Screw-down, Triplock triple waterproofness system
- Bracelet
- Jubilee, five-piece links, Oystersteel
- Clasp
- Folding Oysterlock safety clasp with Easylink 5 mm comfort extension link
Movement
- Calibre
- Calibre 3285, Manufacture Rolex
- Type
- Perpetual, mechanical, self-winding, GMT function; bidirectional self-winding via Perpetual rotor
- Power reserve
- Approximately 70 hours
- Certification
- Superlative Chronometer (official chronometer certification + Rolex certification after casing)
- Notes
- Precision −2/+2 sec/day after casing. Second time zone with independent rapid-setting of the hour hand, 24-hour display, instantaneous date, stop-seconds.
What to check before you buy
- Set the local hour hand forward and back in one-hour jumps and confirm it moves alone. The 24-hour hand and the minutes must stay put — that independence is the whole complication.
- Check where the two bezel colours meet. A two-colour Cerachrom insert has a defined transition, and it should sit precisely on the graduation rather than drifting to one side.
- Look along the Jubilee bracelet for stretch. Five-piece links mean many more pins than an Oyster bracelet of the same length, and Jubilees show their age in the hand before they show it in photographs.
- Confirm the reference suffix matches the bezel in front of you. The letters after the number describe the insert colours, and a mismatched suffix and bezel means one of them has been changed.
- Verify the calibre is 3285 rather than an earlier 3186. The reference and movement changed together, and the seventy-hour reserve belongs to the newer one.
The suffix is the bezel
Rolex encodes the insert colours into the reference itself. The letters following the number on this watch describe the two-colour grey and black Cerachrom insert, and that convention runs across the collection.
For a dealer this is genuinely useful. It means the reference on the papers should predict the bezel in the photographs, and a mismatch between them is not a cosmetic variation — it means either the insert or the paperwork belongs to a different watch. Check that they agree before anything else.
Look, too, at where the two colours meet. The transition should land exactly on a graduation. A boundary that sits slightly off is the kind of detail that is hard to fake well and easy to miss.
An hour hand that moves alone
The calibre 3285 provides a second time zone with independent rapid-setting of the hour hand. Pulled to the right position, the local hour hand jumps in one-hour steps while the 24-hour hand, the minute hand and the seconds all stay exactly where they were.
Test it properly. Step it forward through a full day and back again. If the minute hand creeps, or the 24-hour hand shifts, or the jumps do not land squarely on the markers, that is a fault in the complication the watch exists for.
It is also the single most useful thing about owning one, and it is routinely left out of listings entirely.
Jubilee bracelets show their years
This reference comes on a Jubilee — five-piece links rather than the three-piece Oyster found on the Submariner.
More links means more pins, and more pins means more places for wear to accumulate. A Jubilee that has been worn hard develops a looseness you can feel immediately by holding it horizontally, well before it becomes visible in a photograph.
Handle it before you buy. This is not a fault so much as a condition grade, and it belongs in the price and in the description rather than in a surprise after delivery.
The same hundred metres
Like the Daytona, and unlike the dive references, this is rated to 100 metres on a Triplock crown. It travels well and it is not a dive watch.
Price references like this, faster
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Sources
Not affiliated with Rolex. Specifications are read from the manufacturer's own published documentation on the date shown and may change; the manufacturer's current documentation governs.