Longines 13ZN Flyback Chronograph

About this reference

The Longines reference 5009 was produced during the 1940s and is no longer in production. Collectors prioritize this reference for its 37mm stainless steel "Tre Tacche" case, characterized by a three-notch screw-down caseback that provided enhanced water resistance for the period. It houses the manual-wind caliber 13ZN, a movement featuring an integrated flyback complication that allows the chronograph to be reset and restarted with a single pusher press. The dial typically features a two-register layout with a peripheral tachymeter or telemeter scale. Due to the combination of the oversized steel case and the technically significant movement, secondary market prices generally range from $40,000 to over $100,000 depending on condition and dial configuration. A notable production detail is the use of stepped bezels on certain 5009 examples, which significantly impacts valuation at international auctions where well-preserved specimens frequently exceed initial estimates.