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The Rolex GMT Master is a part of the Rolex Professional watch collection. The GMT Master was launched in 1954 (Brozek, p. 61) to aid pilots who travel through multiple time zones.
A new model of the GMT Master came out in 1983 that features a sapphire crystal which cannot easily be scratched. This model was named the GMT Master II.
A 24-hour watch is a wristwatch with an hour hand that completes a revolution 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.
The face may be arranged in either of two ways: with the 12 at the top (as on standard watch and clock faces) and the 24 at the traditional 6 o'clock position, or else rotated 180กใ with the 24 at the traditional 12 o'clock position and the 12 at the traditional 6 o'clock position (as pictured).
A 24-hour watch with multiple hour hands or a rotating bezel is particularly useful for displaying the time in multiple time zones. Rolex was asked to create what is considered to be the original version of this watch by Pan American Airlines in the 1950s, and as a result they made the Rolex GMT Master II.
A 24 hour watch with a compass card dial can be used to determine direction when set to local noon and used in conjunction with the sun.