Patek Philippe Perpetual Calendar Chronograph 3971

Brand Patek Philippe, Geneva Model “Chronographe quantième perpétuel” Retailed by Mersmann, Lugano (Switzerland) Year circa 1989 Reference 3971 R (2nd series) Movement No. 875 488 Calibre CH 27-70 Q, manual-winding, 24 jewels Case No. 2 870 017 (by Les Ateliers Réunis S.A., Geneva) Material/s pink gold (18-carat) Bracelet brown leather PP strap Buckle pink gold (18-carat) PP pin-buckle Dimensions 36.3 mm. 43.4 x 36.3 mm. Thickness 12.9 mm. Weight 78 gr. (approx.) Signature dial, case and movement Accessories Certificate of origin, booklets, additional pink gold (18-carat) case-back, copy of the original invoice, Extract from the Archives *An additional 0.9% surcharge applies to the hammer price for local delivery only. Patek Philippe Ref. 3971 R (2nd series), chronograph, minute counter, bissextile perpetual calendar, moon phases, AM-PM indication, silver “opalin” dial; pink gold (18-carat) Pink 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, sapphire-crystal screwed case-back, convex lugs, concave bezel; polished “Calatrava” crown. Dial: silver “opalin” colour, with applied radiating pink gold “Bâton” indexes; pink gold “Feuille” leaf-shaped hands. Movement: calibre CH 27-70 Q, 24 jewels, adjusted to heat, cold, isochronism and 8 positions, Geneva Quality Hallmark (“Poinçon de Genève” / Geneva Seal). The original Certificate mentions that this watch was sold by Mersmann S.A., Lugano (Switzerland), on February 24, 1990. In the 1980s-1990s, Patek Philippe’s Certificates of Origin bore a four-letter code corresponding to the watch's date of manufacture (end of production, ready for delivery to the customer). In this case, the letters “PTSP” correspond to February 1990. The Extract from the Archives, dated October 31, 2017, mentions that this watch was made in 1989 and sold on February 2, 1990, for the amount of 66 100 francs. This watch is illustrated in Ali Nael’s book on Patek Philippe watches, pp. 376-377.