This Patek is 40 mm white gold case, 11.13 mm thick, interchangeable full back and sapphire-crystal back, lacquered cream dial with gold applied numerals with luminescent coating, caliber 324 S Q self-winding movement with day, month, leap year and day/night indication in apertures, date by hand, sweep seconds hand, approximately 35-45 hours of power reserve, shiny chocolate brown alligator strap with square scales, fold-over buckle. Water resistant to 30 m.