Patek Philippe Nautilus Collection stainless steel chronograph timepiece. The features of this 40.5mm watch are: mechanical self-winding movement, 60-minute and 12-hour monocounter, date in an apeture, sweep seconds hand, screw down crown, Nautilusfold over clasp, sapphire crystal case back, and water resistant to 120 meters. This timepiece has a chronographic black dial with gold applied markers with luminescent coating displayed on a brushed and polished bracelet.