24 hour watch
From Wikipedia, the free encyclopedia
A 24 hour watch is a wristwatch with an hour hand that rotates 360° every 24 hours. This type of watch is especially useful for airplane pilots, astronauts, members of the military, or anyone who uses a 24-hour clock.
A 24 hour watch with multiple hour hands or a rotating bezel is particularly useful for displaying the time in multiple time zones.
Many (but not all) current digital watches can be set to show the time in 24-hour format.
The Glycine Airman I, a 24 hour watch built by Glycine Watch SA of Switzerland. This watch displays two time zones; one is specified by the hour hand, the other is specified by the rotating bezel. In this picture, the hour hand shows 0315 hours, while the bezel shows 1915.