BREITLING "Copilot". Steel chronograph wristwatch, round case (scratches and off-centered crown), black dial applied with Arabic numerals, hour-markers and railway minute track, three silvered windows, graduated rotating bezel, steel bracelet with folding clasp (reported). Hand-wound mechanical movement. Signed on dial, back, caseback and movement. Back no. 765 CP, caseback no. 1084023 and movement no. 178. Circa 1965. Case diameter: 4.2 cm