Patek Philippe Limited Edition Annual Calendar watch (ref. 5250G), featuring the M. Cal. 315/266 mechanical automatic movement (stamped with the Geneva Seal, with 36 jewels and innovative silicon escape wheel to reduce friction); brushed silver with black batons and Arabic numerals; subsidiary dials for the day of the week and month, as well as apertures for the moon phase and date; power reserve indication; center seconds hand; sapphire-crystal, exhibition case back inscribed “Patek Philippe Advanced Research” with cyclops magnifier over the silicon escape wheel; and 39mm, 18k white gold case on a black alligator strap with a Patek Philippe, 18k white gold deployant clasp. Case, dial and movement signed Patek Philippe.