Patek Philippe Ref. 3970 Pink Gold Patek Philippe, Genève, Ref. 3970 ER. Made in 2003. Very fine and important, water-resistant, 18K pink gold wristwatch with round button chronograph, register, perpetual calendar, moon phases, leap year, 24-hour indication and an 18K pink gold Patek Philippe deployant clasp. Accompanied by the original fitted mahogany box, Certificate of Origin, setting pin, booklet and a spare solid 18K pink gold case back. Three-body, solid, polished, concave bezel, curved and fluted lugs, transparent screwed-down case back, sapphire crystals. Matte silver with applied pink gold faceted bâton indexes, subsidiary dials for the seconds, the 24 hours, the leap year and the 30-minute register, graduation for the days of the month, outer 1/5th seconds scale, aperture for the days of the week, the months and the moon phases. Pink gold baton hands. Cal. 27-70/155 Q, stamped with the Seal of Geneva quality mark, rhodium-plated, fausses cotes decoration, 24 jewels, straight-line lever escapement, Gyromax balance adjusted to heat, cold, isochronism and 8 positions, shock absorber, self-compensating free-sprung Breguet balance-spring. Dial, case and movement signed. Diam. 36 mm. Thickness 13 mm.