Breitling Navitimer

In the 1940s, Breitling added a circular slide rule to the bezel of its Chronomat models.

[2] During the 1950s and 1960s, a version of the Navitimer was offered by the Aircraft Owners and Pilots Association with the AOPA logo on the dial.

In 1961, Scott Carpenter, one of the original astronauts in the Mercury space program, tasked Breitling with incorporating a 24-hour dial instead of the normal 12-hour dial, due to lack of day and night in space travel.

Breitling produced the 24-hour Navitimer, which Carpenter wore on his 1962 space flight.

[3] The first automatic Navitimer chronograph was introduced to the public in 1969; its movement was co-developed by Breitling, Dubois-Depraz, Heuer, and Hamilton.