This self winding Patek Philippe Nautilus 5990/1A watch with its dual time zone mechanism that shows local and home time with day/night indication in apertures. It has a rounded octagon stainless steel case 40.5 mm in diameter and 12.53 mm thick, screw down crown sapphire crystal case back. Its dial is in gradated black, and is embossed with a horizontal pattern, the dial features gold applied hour markers that have been coated with a luminescence finish. Complimented by a steel bracelet and secured with fold over Nautilus clasp. The power behind the 5990/1A is the Caliber CH 28‑520 C FUS and offers functions that include, chronograph with 60-minute counter, dual time zone mechanism indicating local and home time and the date. It has a power reserve of: Min. 45 hours - max. 55 hours. and it is water resistant to 120 M (393 feet).