Patek Philippe & Cie. , Genève, No.187833, case No. 415150, made for Gübelin, Lucerne, circa 1918. Fine 18 ct. gold, keyless watch with split second chronograph, tachometer and 30 minute instantaneous recorder. Three body, massive, demi-bassine, polished with invisible hinge. Gold cuvette. Mat silver with applied gold Breguet numerals, outer minute and chronograph ring, tachometer scale calibrate for 1 Mile, subsidiary seconds and minute register. Gold feuilles hands.