A watch that shows a second time zone, usually with an extra hour hand that turns once in 24 hours against a 24-hour scale.
GMT stands for Greenwich Mean Time, the world reference before Coordinated Universal Time (UTC); in watchmaking it names the dual time zone watch. The most common layout adds a second hour hand that turns once in 24 hours against a 24-hour scale on the dial or bezel, so it also shows day or night in the second zone. Other versions use a 12-hour subdial with a day/night indicator, or a numbered disc in a window. The two times are set a whole number of hours apart, and most movements let the main hour hand be moved hour by hour without disturbing the minutes.
Travelers, pilots and sailors use it to read local time and a second time, usually home, without calculating; the wristwatch version spread from the 1950s with commercial aviation. A GMT watch is not a world time watch, which shows all 24 time zones at once against a ring of city names. Both are complications.
In job listings
GMT is rarely named in job listings. It belongs to the product knowledge of boutique watch roles, whose listings may ask advisors to explain technical features, and to the bench work of watchmakers who service the movements. See current watch specialist roles.
