In the 1950s, business flights were taking off. Increasingly more pilots and cabin crews were finding themselves investing substantial time in time zones far from the house. Therefore, the requirement to track a second, or maybe also third, time zones had become crucial to these pioneering aviators.

In 1955, with layout input from Pan-Am crews, Rolex launched its initial Rolex GMT watch, complying with hot on the heels of the Glycine Airman, which did the same features; however, had hit the marketplace two years earlier in 1953.

The Rolex GMT-Master, like the Airman prior to it, used a 24-hour bezel, an outer turning ring around the face of the watch, to track a second-time zone using a huge, arrow-tipped hand that finished one rotation of the dial every 24-hour.

This hand, called the GMT hand, relocated at half the routine hour hand’s speed, which was installed on the main axis over it. Although they show two time zones, GMT watches need to not be confused with dual time watches, which utilize one primary display to reveal the house time and a second sub-register or secondary 12-hour hand to show the second time zone. GMT watches show 2, or 3, time zones using absolutely nothing more than a solitary dial, a normal mobile phone, i.e., hours, minutes, as well as seconds, a 24-hour, or GMT, hand, and a revolving bezel.

One Time Zone, Two, or Even Three?

We mentioned previously that it is feasible, however uncommon, to utilize some GMT calibers to reveal three time zones concurrently; however, this is not real of all models, nor is it specifically simple on all those that possess this performance. The key is having the ability to set the GMT/24-hour hand independently of the conventional hour hand. In the first Rolex GMT-Master watches, this was not possible. It was with the introduction of the now-famous GMT-Master II watches in the early ’80s that this ended up being an alternative.