Gallet Chronograph 1940s Mk1 Flying OfficerThe Mk 1 US Air Force Flying Officer We are delighted to offer this super condition and rare early large size steel chronograph. The Gallet Flying Officer was launched in 1939 as an aide to military pilots for quickly calculating changes in time zones as longitude lines were crossed. The dial is cream with dual register chronograph function , wit a so called snail tachymeter track and there is are cities listed, by time zone, around the outer track.