细节
Patek Philippe. A fine 18K gold openface perpetual calendar keyless lever watch with phases of the moon
Signed Patek Philippe, Genève, movement no. 931'255, case no. 327'501, ref. 725/4, retailed by Beyer, manufactured in 1972
Cal. 17'''170 nickel-finished lever movement stamped twice with the Geneva seal, 18 jewels, bimetallic compensation balance, swan neck regulator, the gilt matt dial with applied baton and Arabic numerals, gold dauphine hands, aperture for the combined month, date and day display, subsidiary dial for phases of the moon combined with constant seconds, in plain circular case with snap on back, case, dial and movement signed
46 mm. diam.