Designed to show the time in two time zones simultaneously, the GMT-Master, launched in 1955, was originally developed as a navigation instrument for professionals crisscrossing the globe.
Instantly recognizable with its two-color 24-hour graduated bezel – although single-color on a few variations – The GMT-Master became the favorite watch of pioneering aviators and would later contribute to some of the greatest aeronautical achievements, as well as accompany astronauts at the height of the space age.