Patek Philippe Perpetual Calendar 2438/1

Patek Philippe. An extremely fine and rare 18K gold perpetual calendar wristwatch with sweep centre seconds, phases of the moon, screw back and magnified calendar apertures Signed Patek Philippe, Geneve, movement no. 888'154, case no. 2'611'731, ref. 2438/1, manufactured in 1955 Cal. 27 SC Q nickel-finished lever movement stamped twice with the Geneva seal, 18 jewels, bimetallic compensation balance, micrometer regulator, the silvered matte dial with applied gold baton numerals, gold dauphine hands, outer Arabic five minute divisions, sweep centre seconds, two magnified apertures for day and month, subsidiary dial indicating phases of the moon combined with date, the large circular water-resistant-type case with downturned fluted lugs, screw back, 18K gold Patek Philippe buckle, case, dial and movement signed 37 mm. diam.