Patek Philippe 3970EJ-051 Perpetual Calendar Chronograph Yellow Second Series BIG HALLMARKS (25631)

25631 Patek Philippe 3970 J Perpetual Calendar Chronograph, 3970, 3970EJ051, 3970E, second series, yellow gold case on a strap with an yellow gold buckle, chronograph, perpetual calendar ( day, date, month, leap year, moon phases), manual wind, 24 hour indicator, sapphire crystal, display back, water resistant to 25 meters, size: 36mm, thickness: 12.9mm, second case-back included, Like New with original box and papers dated November 1999. Comes with Patek service papers from April 2016.

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This watch is in stock and available for purchase at our retail showroom in Boston.

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More about Patek Philippe 3970EJ-051 Perpetual Calendar Chronograph Yellow Second Series BIG HALLMARKS

This is an 18K yellow gold Patek Philippe Perpetual Calendar Chronograph 3970EJ-051. 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 yellow gold faceted 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.

The manual winding caliber CH 27-70 Q movement is 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.

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.