Patek Philippe Perpetual Calendar Chronograph 3971

An extremely rare 18k Patek Philippe ref. 3971 gentelman's wristwatch. Exceedingly rare watch. Sapphire glass, chronograph with perpetual calendar, moon phases, date, month and week day apertures. Small dial at 9 o'clock for day and night. Long second hand. Dial at three o'clock for the four year cycle including leap years. Long hand as a 30 minute counter of the chronograph. Small dial at 6 o'clock for date aperture and moon phase. Window at 12 o'clock for week day and month. White enamel dial with gold baton indices. Gold feuille hand and blued steel second hand. Screw-mounted back panel with sapphire glass window. Original leather bracelet and clasp. Manual winding. Movement no. 875534, ref. 3971, cal. 27-70Q, case no. 2856556. Geneva hallmarks. 24 jewels. The watch was overhauled by Patek Philippe in Geneva in the summer of 2022. Dial, case, movement and clasp signed. Correction pen missing. ⌀ 36 mm. L 23.5 cm. Weight 78.28 g. Geneva, Switzerland, ca. 1990.