Patek Philippe, Very Fine Ref. 3971E, 2nd Series, Perpetual Calendar Chronograph, 18k Gold, circa 1989 Case: 36 mm, 18k yellow gold, screw down sapphire display back, round push buttons, fluted lugs, Patek Philippe case maker stamp, number 28 in the key Poinçon de Maître, punched to the side of the lug, No. 2851206 Dial: opaline silvered dial, applied yellow gold indexes, 30 minute register, perpetual calendar with moon phases, day, date month, leap year, a.m/p.m indication, seconds sub dial at 9 o'clock, yellow gold feuille hands Movement: Cal. 27-70 Q, stamped with the Seal of Geneva Quality Mark, rhodium-plated, fausses cotes decoration, 24 jewels, straight-line lever escapement, Gyromax balance adjusted for heat, cold, isochronism and 8 positions, shock absorber, self-compensating free-sprung Breguet balance spring Band: Patek Philippe crocodile band and original 18k yellow gold buckle Signed: Patek Philippe on the case, dial, movement, band and buckle This timepiece is accompanied by an Extract from the Archives stating the date of manufacture as 1989, date of sale May 12th,1989 HID03101062020 © 2020 Heritage Auctions | All Rights Reserved