GMT Master

The Rolex GMT was designed as an aviator watch. As in the 1940s and 50s flying distances got longer and the pilots travelled through multiple time zones, Pan Am asked Rolex in the 1950s to develop a watch which could tell different times simultaneously. The first GMT got produced in 1954 and got introduced with a fourth hand allowed the display of an additional time, with the corresponding numbermarkings on the outer bezel.