Patek Philippe 3970EG-016 Perpetual Calendar 3970G Chronograph 18K White Gold / Silver Dial (34904)

34904 Third Series Patek Philippe 3970EG Perpetual Calendar Chronograph 3970G, 4th Series, 18K white gold on a strap with a matching white gold deployant buckle, case is in excellent condition with deep hallmarks clearly visible, manual wind Patek Philippe caliber CH 27 70 Q, 30-minute chronograph, perpetual calendar (in English) with day, date, month, leap year, and moon phase, 24-hour indicator, sapphire crystal, display back, water resistant to 25-meters, diameter: 36mm, thickness: 12.9mm, Like New with Original Box, Additional Solid Caseback, Setting Stylus, and Papers dated February 2001.

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More about Patek Philippe 3970EG-016 Perpetual Calendar 3970G Chronograph 18K White Gold / Silver Dial

This is an 18K white gold Patek Philippe Perpetual Calendar Chronograph 3970EG-016. It has a leather strap with a matching 18K yellow gold deployment clasp, and a scratch resistant sapphire crystal The 36mm diameter solid three-body case, downturned lugs, and rounded stepped bezel are polished. There is a screwed-down sapphire crystal display back with a setting pin and an additional case back. It has a satiné silver dial with applied white gold faceted "boat shaped" baton hour indexes and feuille hands. A grand complication watch, it has a round-button chronograph and perpetual calendar with subsidiary dials for the seconds and for 24 hours at 9 o'clock, the 30-minute register at 3 o'clock, and the moon phase and days of the month at 6. The day of the week and the month are indicated in twin window apertures at 12. It's water resistant to 25 meters/90 feet, and the 12.9mm thick case, dial, and movement are all signed.

This Patek Philippe Perpetual Calendar Chronograph 3970EG-016 has a mechanical manual winding caliber CH 27-70 Q movement that's rhodium-plated with fausses cotes 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).

This Patek Philippe Perpetual Calendar Chronograph 3970EG-016 was introduced c. 2000. In 1925 Patek Philippe brought out the first perpetual calendar wristwatch that automatically adjusted itself for the months with only 30 or 28 days, as well as for leap years. This was a grand complication that was a rare specialty. In 1941, at the beginning of World War II, Patek started regular manufacture of the perpetual calendar watches, a staple that helped the company to survive the war.