Rolex GMT-Master II, 40 mm

The GMT-Master II is Rolex's travel watch. It was built for Pan American pilots in the 1950s, and the current 40 mm generation, introduced in 2018 on caliber 3285, does the same job with a ceramic bezel and a 70 hour movement. The steel references are the blue and black 126710BLNR, the gray and black 126710GRNR, and the left-handed green and black 126720VTNR, which puts the crown at nine o'clock. Rolesor and solid gold versions sit above them.

Every version shares the same mechanics: a 40 mm Oystersteel or gold Oyster case, a screw-down crown, 100 meters of water resistance, a date under a Cyclops lens, and a bidirectional 24 hour bezel in Cerachrom ceramic. The choice between them is a choice of color and bracelet, not of capability.

The specification

Rolex publishes diameter, water resistance, bezel, caliber, power reserve, precision and bracelet. It does not publish case thickness, lug to lug or lug width, so those three rows are measurements taken from watches rather than specifications, and they vary by a few tenths of a millimeter between measurers.

How the dual time actually works

The 24 hour hand makes one revolution a day and is read against the bezel. The ordinary hour hand jumps forward or back in one hour steps from the crown, without moving the minute hand or stopping the seconds. That is what "GMT-Master II" means and it is what separates this from a cheaper GMT, where the 24 hour hand is the adjustable one and local time can only be changed by resetting everything.

In use, you set the 24 hour hand to home time and leave it. When you land, you pull the crown one click and push the hour hand to local time. Nothing else moves, so the watch keeps its accuracy across the trip and you do not lose the seconds. It is a small thing that makes a large practical difference, and what a GMT watch is for and the guide to GMT and world time watches both explain the distinction in more detail.

The bezel adds a third zone by offset, at the cost of your reference position. To see many zones at once, a world timer is the right instrument, as GMT versus world timer sets out.

How it wears

Physically this is a Submariner case with a different bezel, and it wears like one. About 48 mm lug to lug decides the fit, and 40 mm understates the presence of the crown guards and bezel. On a wrist of 16.5 cm (6.5 in) or more it is proportionate. Below about 16 cm (6.3 in) the lugs overhang.

At around 12 mm it is thinner than a Submariner but still a tall watch, and it does not slip under a fitted cuff. The Jubilee bracelet drapes better and feels lighter on the wrist than the Oyster, and it is the more comfortable of the two for long wear. Both use the 5 mm Easylink extension rather than the finer Glidelock, which is a real omission on a watch designed for aircraft cabins and hot climates where wrists swell.

Put your measurement through the watch size calculator and read the guide to sizing and fit before choosing.

The movement, and living with it

Caliber 3285 is the GMT member of the same family as caliber 3235: 4 Hz, 31 jewels, a Chronergy escapement, a paramagnetic Parachrom hairspring, Paraflex shock absorbers and about 70 hours of reserve, with the added independent hour wheel. The Rolex 3235 page covers the architecture the three calibers share.

Accuracy in practice is generally inside the published -2 to +2 seconds per day, because Rolex tests the assembled watch rather than the bare movement, which is stricter than COSC alone at -4 to +6. Use the accuracy calculator over a week before you decide yours is running badly, and the guide to accuracy and chronometer standards explains what the numbers are actually measuring.

It hacks and it hand winds. The date advances with local time, so pushing the hour hand backward past midnight steps the date back correctly, which is a genuinely convenient piece of engineering when you fly west. The usual caution about the quickset applies late in the evening: see when it is unsafe to change the date.

What it is genuinely good at

Doing the one job properly. The jumping hour hand is the right implementation of a travel watch, the ceramic bezel does not fade, and the 24 hour scale is legible at a glance. A 70 hour reserve means the watch survives a weekend in a hotel safe still running on home time.

It is also a genuinely durable object. A 100 meter case with a screw-down crown covers swimming, as is 100 meters enough explains, and the Oystersteel case resists corrosion better than the 316L most brands use, a difference put in proportion in the steel comparison. Service coverage exists in most countries, which matters for a watch you take abroad.

What is wrong with it

The bezel rotates in both directions and is easy to knock, so your third-zone reference gets lost in a bag. There is no way to lock it.

The Easylink clasp is coarse for a travel watch. The Cyclops lens distorts the crystal. Lume is applied to the hour markers and hands but not to the bezel numerals, so the 24 hour scale is unreadable in the dark, which is exactly when a night flight needs it. The 100 meter rating is modest for a watch this thick.

Parts go only to authorized watchmakers, so independent servicing options are limited, and Rolex service centers refinish cases as standard unless you specify otherwise in advance. And this is the model where the buying process is at its worst: allocation lists at authorized dealers are long, opaque and unranked, which is covered in why Rolex watches are hard to buy.

What it costs, new and used

US list prices during 2026 were about $11,050 for the 126710BLNR and the 126710GRNR, and about $11,350 for the left-handed 126720VTNR, all quoted before sales tax, which varies by state. Elsewhere the list price moves with local tax, import duty and distribution, and Rolex has raised list prices in most recent years.

Almost nobody pays those figures. Authorized dealers receive allocations rather than placing orders, so the practical route to a steel GMT-Master II is a waiting list of unknown length or the secondary market. Through 2026 the steel Batman and gray-black references have generally traded somewhere between roughly $12,500 and $16,000 depending on age, papers and country. The withdrawal of the red and blue references during 2026 pushed those particular watches far higher, with reported transactions well above $19,000. All of that is a moving range rather than a price.

Ten year running cost is more predictable: one complete service at roughly $800 to $1,200, plus scheduled insurance at roughly 1 to 2 percent of the insured value each year. Insure the price you would have to pay to replace it, not the list price, which on a premium-priced watch is a meaningful difference. The cost of ownership calculator will run your own figures, and if you are buying used, buying a pre-owned watch and spotting a fake both apply: this is among the most heavily counterfeited references in the world.

The alternatives, and when each is the better answer

Inside the catalog, the Submariner is the answer if you want depth rating rather than a second zone, the Explorer is thinner and far easier to buy, and the Datejust is the dressier choice. The Explorer II offers a fixed 24 hour bezel and the same caliber 3285 in a larger 42 mm case, and has usually been easier to obtain.

Outside it, Tudor's Black Bay GMT and Black Bay Pro do the same job with an in-house jumping hour movement for roughly a third of the price, from the same parent group: Rolex versus Tudor sets out where the money goes. Omega's Seamaster and Aqua Terra GMT models carry METAS certification and are usually available at list, compared in Rolex versus Omega. If you only need the function, Grand Seiko, Longines and several microbrands sell true jumping-hour GMTs for under $3,000, and one of them will keep home time just as reliably.

Buy the GMT-Master II if you actually cross time zones, you want the Rolex execution of the complication, and you have priced the premium honestly against the alternative of waiting. Do not buy it as a first mechanical watch bought above list, and do not buy it for a bezel color you were told would appreciate.