The Patek Philippe Self-Winding Mechanical Watch features the advanced Caliber 31-260 PS QL. This masterpiece includes an in-line perpetual calendar with day, date, month, leap year, and day/night indications in apertures, moon phases, and small seconds. The opaline rose-gilt dial with charcoal gray accents is highlighted by white gold applied faceted baton-style hour markers. Encased in platinum, the watch has a diameter of 41.3 mm and a height of 11.07 mm, offering water resistance up to 30 meters. It comes with interchangeable solid and sapphire crystal case backs for added versatility. The alligator leather strap, with hand-stitched square scales in a shiny chocolate brown finish, is secured by a platinum fold-over clasp, ensuring elegance and sophistication.