Longines Spirit PIlot Flyback Blue 39.5 mm

Longines patented the flyback on 16 June 1936, a world first, and built it for pilots timing successive legs of a flight. That mechanism returns here in a hand wound chronograph, COSC certified, with a silicon balance spring and 68 hours. A 39.5 mm steel case, a ceramic bezel, a matt blue dial, and 100 m. (Reference L3.721.4.93.9 / L37214939).