Patek Philippe. A Very Fine and Rare 18k Gold Perpetual Calendar Chronograph Wristwatch with Moon PhasesSigned Patek Philippe, Genève, Ref. 1518, Movement No. 863'712, Case No. 644'109, Manufactured in 1946Cal. 13''' mechanical movement, stamped with the Geneva Seal, 23 jewels, silvered matte dial, applied gold Arabic numerals, outer railway five minute divisions and tachometer scale, day and month apertures in French below 12 o'clock, three subsidiary dials for 30 minute register, constant seconds, and date combined with phases of the moon, circular case, downturned lugs, two rectangular chronograph buttons in the band, snap on case back, 18k gold Patek Philippe buckle, case, dial, and movement signed35mm diam.