Patek Philippe Perpetual Calendar Chronograph 3970EJ

Brand Patek Philippe, Geneva Model ‘Chronographe quantième perpétuel’ Year circa 1988 Reference 3970 E J (2nd series) Movement No. 875 128 Calibre CH 27-70 Q, manual-winding, 24 jewels Case No. 2 840 110 (by Les Ateliers Réunis S.A., Geneva) Material/s yellow gold (18-carat) Bracelet brown leather PP strap Buckle yellow gold (18-carat) pin-buckle, signed Dimensions 36 mm. 43.4 x 36 mm. Thickness 12.9 mm. Signature dial, case and movement Accessories Extract from the Archives Patek Philippe Ref. 3970 E J (2nd series), chronograph, 30-minute counter, bissextile perpetual calendar, moon phases, AM-PM indication, screwed solid case-back, concave bezel, stepped lugs, silver ‘opalin’ opaline-white two-tone dial, lapidated indexes (1st type); -- A chronograph bissextile perpetual calendar wristwatch, with silver opaline-white two-tone dial and screwed case-back -- Yellow gold (18-carat), manual-winding, round-shaped, gentleman’s wristwatch, with subsidiary seconds at 9 o’clock and nine horological complications: • 1/5 second chronograph with round-shaped push-pieces located on the case-band • Half-instantaneous 30-minute counter (subsidiary dial at 3 o’clock) • Half-instantaneous perpetual bissextile calendar à guichets (with apertures) • Date of the month (subsidiary dial at 6 o’clock) • Day of the week (aperture at 11 o’clock; indications given in English) • Month of the year (aperture at 1 o’clock; indications given in English) • Four-year cycle of leap-years (subsidiary dial at 3 o’clock) • Phases of the moon (aperture at 6 o’clock) • Diurnal (day-time) and nocturnal (night-time) hours with a 24-hour (AM-PM) scale (subsidiary dial at 9 o’clock) -- Case: two-piece, polished and satin-finished, rounded profile case-band extended by a concave stepped bezel, wide stepped lugs, screwed case-back; polished ‘Calatrava’ crown. Dial: silver ‘opalin’ opaline-white colour, two-tone, with yellow gold applied radiating ‘Bâton’ indexes (at 1, 2, 4, 8, 10 and 11 o’clock) and square pyramidal-shaped indexes (at 3, 5, 7 and 9 o’clock); yellow gold ‘Feuille’ leaf-shaped hands. Movement: calibre CH 27-70 Q, manual-winding, 24 jewels, rhodium-plated with ‘fausses côtes’ decoration, going barrel, straight-line lever escapement, free-sprung Gyromax balance, self-compensating Breguet hairspring, adjusted to heat, cold, isochronism and 8 positions, Geneva Quality Hallmark (“Poinçon de Genève” / Geneva Seal); chronograph work on the top plate; calendar work on the main plate, under the dial. -- The Extract from the Archives, dated March 3rd, 2016, mentions that this watch was made in 1988 and sold on March 17, 1988.