In 1952, Willy Breitling developed a wrist-worn chronograph with a circular slide rule that would allow pilots to perform all necessary flight calculations. The AOPA was (and remains) the largest pilots’ club in the world, counting nearly every US aviator among its ranks.
BREITLING Navitimer B01 Chronograph 41MM Blue Dial Men’s Watch AB0139241C1P1
Dial Type / Hands / Markers: Analog / Silver Tone / Baton. Crystal: Cambered Sapphire, Glareproofed Both Sides. Dial Color: Blue. Case Color: Silver. Band Color: Black.