From Christies website:
Lot Description
Signed Patek Philippe & Co., Genève, ref. 1527, movement no. 863'247, manufactured in 1943
Cal. 13''' nickel-finished lever movement stamped with the Geneva seal, 23 jewels, bimetallic compensation balance, silvered matte dial, applied gold Arabic numerals, outer railway five minute divisions and tachymetre scale, three subsidiary dials for constant seconds, 30 minutes register, date and moon phases, tonneau-shaped case, extended downturned lugs, snap on back, two rectangular chronograph buttons in the band, 18K gold Patek Philippe buckle, case, dial and movement signed
37.6 mm. diam.