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Caliber: 5200; 5110 DT; 5100; 1088/1Functions: Hours, minutes, seconds, chronograph, date; hours, minutes, centralized seconds, additional time zone, AM/PM indication, link date; hours, minutes, seconds, date; hours, minutes, seconds, date Power Reserve: 52 hours; 60 hours; 60 hours; 40 hoursWinding: AutomaticFrequency: 4Hz (28,800 link vph)Jewels: 54 link jewels; 37 jewels; 37 jewels; 26 jewels

The GMT-Master and the GMT-Master II are often associated with space although never in an official capacity with any space programs. Instead theyve been popular personal link watches to bring up. NASA Astronauts Lloyd link Blaine Hammond and Leroy Chiao both wore their examples on a number of missions three missions for Chiao and two link for Hammond in the 1990s.