An early signed dial Breitling Navitimer with AOPA logo
Movement: Venus Cal. 178 manual-wind movement
Case: Stainless steel 42mm with beads of rice bezel; snap-on case back; push-down crown; and chronograph pushers at 2 and 4 o'clock
Dial: Black dial with luminous Arabic numerals and hands; inner double time scale for Miles Per Hour and Kilometers Per Hour; outer revolving slide rule on silvered chapter ring; subsidiary dials at 3, 6, and 9 o'clock for 12 hour, 30 minute, and constant seconds
More about Breitling:
In the early 1950s, Breitling released their first pilot’s watch, the ref. 806. Featuring a slide rule chronograph, the model was called the “Navitimer." The slide rule was an important innovation for pilots, because it equipped them with the means to make important calculations mid-flight. While the Chronomat was the first Breitling model to feature a slide rule, the Navitimer--with its long association with the Aircraft Owners & Pilot's Association or AOPA--established Breitling's reputation as a watch company for pilots. The AOPA declared the Navitimer as their official timepiece.
1968 saw a completely new design of Navitimer, as the taste for larger watches dominated the industry. The resulting reference, the 816, was given the affectionate nickname "pizza." At an impressive 48mm, this was the first of the "big case" Navitimers, the second being its automatic successor the reference 1806 (referred to as the "fried egg").
Like previous Navitimers, the ref. 816 contained the manually-wound Venus 178. The ref. 816 also had the potential to be a "left-wound" watch, hence the hole at 9 o'clock to accommodate the winding crown. Perhaps this modification was devised in order to outfit the watch with Breitling's new in-house caliber 11 movement (which the reference 1806 contained), but the ref. 816 ceased production after only ten years of availability, making it among one of the rarest models of Navitimer.