LONGINES REF. 7413-9 MEDICAL FLY-BACK CHRONOGRAPH, CIRCA 1967
Three body stainless steel case, n. 15316393, sloped bezel, faceted lugs, screw back, Longines crown, round pushers. Not original strap and buckle.
Silver dial with sunburst finishing, signed, applied bâton indexes and logo, minutes division with 1/5th of second fraction, sunk subdials with concentric engravings for seconds and 30-min counter, outer pulsometer scale. Luminescent bâton hands.
Signed manual winding movement, rhodium-plated caliber 30CH, n. 13925142, 18 jewels, column wheel system, lever escapement, monometallic balance with screws, blued Breguet hairspring, shock-absorber, acronym LXV on balance bridge.
A similar model with pulsometer dial is illustrated in Longines Watches by John Golberger.
Diameter Ø: 38 mm