Breitling Navitimer Super 8 chronometer is an homage to the original Ref. 637,a 1930s/1940s stopwatch worn by pilots inthe XX century. Total diameter of the self-winding Navitimer Super 8 including the bidirectional bezel measures 50mm all-in. The model is available in stainless steel with a black dial or titanium with an army green dial. As befits a real pilot's watch, both versions boast excellent readability.