Patek Philippe Nautilus 40mm White Gold Perpetual Calendar 40mm 18K white gold case, 8.42 mm thick, blue sunburst dial with gold applied luminescent hour markers, caliber 240 Q self-winding movement with perpetual calendar, moon phases, day, date, month, leap year, and 24-hour indication by hands, approximately 38-48 hours of power reserve, 18K white gold bracelet, fold-over buckle. Water-resistant to 60 m. Patek PhilippeÕs thinnest perpetual calendar.