GOLD LONGINES FLY-BACK CHRONOGRAPH 13ZN REF. 3901, CIRCA 1938 Three-body circular 18K gold case, signed, n. 5463711, stepped bezel, hinged lugs with fixed bars, snap on caseback, rectangular pushers. Not original strap and buckle. Champagne two-tone dial, signed, “anti/magnetique”, inset bâton indexes, minute track and 1/5th of seconds fraction on silvered ring, blue snail tachymeter and outer telemetric graduations, subsidiary dials for seconds and 30-min register, feuille hands. Manual-winding caliber 13ZN, gilded, signed, n. 5463711, column wheel system with fly-back function, lever escapement, monometallic balance with screws, blued Breguet hairspring. Accompanied by Longines Extract from the Archives. Diameter Ø: 37 mm Note: working. TAGS: watch - orologio