This Patek Philippe Nautilus 5990 has been fully diamond set with a total of 21.85ct diamonds. This watch features a factory Black gradated dial with gold applied hour markers with luminescent coating, sapphire case back, sapphire glass, double fold clasp, Self-winding mechanical movement. Caliber CH 28-520 C FUS. Dual time zone mechanism indicating local and home time. Local and home day/night indication in apertures. Local date by hand.