Breitling. A stainless steel automatic chronograph wristwatch with date and left handed crown, Navitimer Chrono-matic, Ref. DDE.BR. 11525/67-1806, circa 1970.
Movement: cal. 12, automatic, 17 jewels.
Dial: black, Arabic and baton indexes, silvered engine-turned subsidiary dials for 30-minute and 12-hour registers, aperture for date, MPH and KM scales.
Case: stainless steel, screw-down back, bi-directional rotating bezel, inner slide rule scale, no. 1318118.
Signed: case, dial and movement.
Dimensions: diameter 48mm. £1,500-£2,000

The Breitling Navitimer is the iconic watch for pilots. Its slide rule bezel feature is used to calculate crucial flight information such as climbing speeds, fuel consumption and flight times.