The Rolex GMT-Master Was Built for Men Who Lived in Two Time Zones

At 2 a.m. on Sunday, November 1, most of the United States sets its clocks back an hour. Arizona mostly sits it out and Hawaii never joined in, which means that for one night a lot of Americans will be doing the arithmetic airline crews do every working day. What time is it here, what time is it at home, and is anybody back there awake?

In the 1950s that arithmetic got harder. Jet travel was arriving, and crews were crossing time zones faster than their bodies or their watches could follow. Pan American World Airways, then the leading international airline, went looking for a watch that could keep two times at once. The answer came from Rolex, and it is still on the wrists of people who never fly anything.

Pan Am asks for a fourth hand

The brief was simple. A pilot needed local time and a reference time on the same dial, readable at a glance. Wikipedia's account of the GMT-Master credits Frederick Libby, a senior Pan Am navigator and a veteran of the Second World War, with choosing Rolex for the job because he had worn one himself.

Rolex added a fourth hand to the usual three. It travels around the dial once every 24 hours instead of every 12, and it points to a 24-hour scale on a rotating bezel. Set that hand to Greenwich Mean Time, the reference clock of aviation and navigation, and the name of the watch explains itself. The bezel was split in two colors, red for the daylight hours and blue for the night, so a navigator could tell at a glance whether it was day or night at the other end of the trip.

The first GMT-Master, reference 6542, arrived in the mid 1950s. Most accounts, including Sotheby's and Bob's Watches, date the debut to 1955, while a few give 1954. It had a 38mm steel case and an automatic movement, the calibre 1036 at first. It had no crown guards and was water resistant to 50 meters, according to Bob's Watches. Its bezel insert was made of Bakelite, an early plastic that turned out to be fragile and prone to cracking, and Rolex soon replaced it with metal.

Pan Am issued the watch to its pilots and navigators, and kept doing so until the airline ceased operations in 1991.

The long middle years

In 1959 the 6542 gave way to reference 1675. The case grew to 40mm and gained crown guards, and the watch settled into the shape most people picture today. It stayed in production until 1980. That long run is the reason the GMT-Master became a culture object rather than a tool. It was there for every decade of the jet age.

It also went to the movies. Honor Blackman's pilot, Pussy Galore, wore a GMT-Master in Goldfinger in 1964. Marlon Brando wore a 1675 with its bezel removed in Apocalypse Now, and that watch sold at auction in 2019. If you know the Submariner side of the family, our Rolex Submariner history covers how the dive watch and the pilot's watch grew up side by side on the same Oyster case.

The GMT-Master II and the independent hour hand

The original design had a limit. The 24-hour hand moved with the main hands, so changing local time meant resetting everything. In 1982 Rolex introduced the GMT-Master II with the calibre 3085, which decoupled the two. The local hour hand could now jump forward or back in one-hour steps while the 24-hour hand kept home time running untouched. Land in a new city, pull the crown, click the hour hand, and you are done.

Time+Tide identifies that first GMT-Master II as reference 16760, nicknamed the Fat Lady for its thicker case, and notes it was also the first Rolex GMT with a red and black bezel, the one collectors call the Coke. The plain GMT-Master carried on alongside it for several years before the II took over the line.

The trick still works the same way. Set the 24-hour hand to home, set the hour hand to wherever you are, and turn the bezel if you want to follow a third zone. It is the most useful complication in the catalog for a man who travels, and far simpler to own than a chronograph like the Omega Speedmaster Moonwatch.

Ceramic, and the trouble with red

In 2005, for the model's 50th anniversary, Rolex gave the GMT-Master II a Cerachrom ceramic bezel insert, and by 2007 the steel model had it too. Ceramic does not fade or scratch the way aluminum does. It does have one problem. According to Wikipedia, Rolex could not at first produce red in ceramic at all, which is awkward for a watch whose most famous bezel is half red.

The fixes came slowly. A blue and black bezel arrived on the steel reference 116710BLNR in 2013, and collectors named it the Batman. A red and blue ceramic bezel followed in 2014, but only in white gold. Steel buyers waited until 2018 for reference 126710BLRO on a Jubilee bracelet, which Sotheby's describes as the first time a red and blue ceramic bezel appeared on a steel GMT. The same year brought a brown and black bezel in Everose gold, the Root Beer, and the calibre 3285 with a 70-hour power reserve. In 2022 Rolex put the crown on the left side of a green and black model, reference 126720VTNR, a layout collectors call destro.

Then, in April 2026, the Pepsi left the catalog. Hypebeast reported that Rolex removed every version of the red and blue GMT-Master II, steel and white gold, with the changes confirmed at Watches and Wonders 2026. Rolex gave no official reason. The long-running speculation points to the difficulty of making that two-color ceramic bezel.

The GMT-Master line, by the numbers

Here is how long the key references lasted, using the production dates Sotheby's and Time+Tide publish. The run lengths are Quiet Menace's own arithmetic.

The 1675 outlasted the steel ceramic Pepsi by more than two to one. The Pepsi that collectors chased hardest had one of the shortest runs in the line.

If you are shopping for a vintage 1675, read our guide on how to buy your first mechanical watch before you pay for a bezel insert that was swapped decades ago. For more, see watch history, heritage brands and the Quiet Menace watches section. Sotheby's guide to the key Pepsi references and Time+Tide's history of the line go deeper on each reference.

This weekend the clocks fall back, and for a night everybody gets to be a navigator. The GMT-Master was built for men who did that sum every day, and it still does it for them with one extra hand.