This Patek is 40.8 mm stainless steel case, sapphire-crystal back, black embossed dial with gold applied numerals and luminescent hour markers, caliber 324 S C FUS self-winding movement with Aquanaut Travel Time dual time zone mechanism indicating local and home time, local and home day/night indication in apertures, local date by hand, sweep seconds hand, approximately 35-45 hours of power reserve, black Tropical composite strap, Aquanaut fold-over buckle. Water resistant to 120 m.