The GMT function for wristwatches was originally developed in the 1950s for pilots whose job regularly took them back and forth between different time zones. The acronym GMT refers to Greenwich Mean Time: the official ‘world time’ until 1928. Today it has been replaced by UTC or Coordinated Universal Time, however most watchmakers still use the older terminology when referring to watches with a second time zone. How do GMT watches work? For more information about watches that offer this feature:
https://www.davosa-usa.com/blogs/story-time/dual-time-watch
https://www.davosa-usa.com/blogs/story-time/dual-time-watch
https://www.davosa-usa.com/blogs/story-time/gmt-watches
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