Patek Philippe Perpetual Calendar Chronograph 3971

A FINE AND RARE 18K YELLOW GOLD PERPETUAL CALENDAR CHRONOGRAPH WRISTWATCH WITH REGISTER, MOON-PHASES, LEAP YEAR AND 24-HOUR INDICATION 1989 REF 3971EJ MVT 875406 CASE 2851227 crocodile diameter 36 mm , • cal 27-70Q manual winding damascened nickel lever movement stamped with the Geneva seal, 24 jewels, free-sprung Gyromax balance, adjusted to heat, cold, isochronism and 8 positions • silvered dial, applied gold square and baton indexes, apertures for day and month, three subsidiary dials, the first and the third engine-turned, indicating constant seconds combined with 24-hour indication, 30-minute register combined with leap year indicator and date combined with moon-phases • 18k yellow gold case, screw-down sapphire crystal display back • case, dial and movement signed • with an 18k yellow gold Patek Philippe buckle • Extract from the archives confirming sale on 16 October 1989, Certificate of Origin and presentation case