Patek Philippe, Fine White Gold Automatic Calendar Wristwatch with Moon Phases and Power Reserve Indication
Cal. 315 S IRM QA LU (SI) automatic movement, stamped with the seal of Geneva, 36 jewels, silicon escape wheel, silvered dial, applied black Arabic numerals and baton indexes with luminescent dots, luminescent Feuille hands, center seconds, subsidiary dials for day and month, fan form aperture for moon phases, aperture for date at 6, power reserve indicator at 12, outer minute track, 18k white gold case, sapphire crystal display back with integrated magnifying lens inscribed Patek Philippe Advanced Research, case, dial, and movement signed, with an 18k white gold Patek Philippe folding clasp.
Accompanied by an Extract from the Archives confirming the date of sale on 20 December 2005.
Patek Philippe’s Advanced Research division is devoted to technical innovations for the future of horology. The development of Silinvar, an ultra-modern silicon technology, improves upon Patek Philippe’s mastery in precision and efficiency. Previously, hairsprings and other vital parts made from carbon steel were susceptible to oxidation, rust, magnetism, and temperature variations. The development of Silinvar eliminates these variables with the added benefit of reduced mass. Silinvar is in fact three times lighter than conventional carbon steel springs, transmits energy more efficiently, and can be shaped more accurately, making it an ideal material for watchmaking
The Ref. 5250 was launched in 2005 in a limited series of only 100 examples in white gold.
Please note that the strap may be removed for international shipping.