Patek Philippe Perpetual Calendar Chronograph Yellow Gold 3970E

Pre-owned Patek Philippe Perpetual Calendar Chronograph 3970E. https://preowned.blacktagwatches.com/... 36 mm yellow gold case. Solid case back. Excellent condition with hallmarks located on the lugs are clear and defined. Screw down caseback. Excellent condition silver dial with leap year indicator and 30-minute counter at 3 o’clock, moon phase indicator and date sub-dial at 6 o’clock, seconds sub-dial at 9 o’clock, weekday and month apertures at 12 o’clock. Manual Swiss Made Caliber 27-70 Q, features 24 jewels. Power reserve of 60 hours. (Based on the Lemania caliber 2310) column wheel movement that’s rhodium-plated with Cotes de Geneve embellishment, and the stamp of the Seal of Geneva quality mark. It’s constructed with 24 jewels, a shock absorber mechanism, and a straight-line lever escapement. It includes a self-compensating Breguet balance spring, and the patented Patek Philippe Gyromax balance that compensates for cold, heat, isochronism, and 8 positions. The case, dial, and movement are all signed. The mechanism oscillates at a frequency of 18,000 vph (2.5 Hz). Black alligator leather strap with gold tang buckle. Box and Extract from Archives, 1994 production year. Push tool.