Audemars Piguet Royal Oak perpetual calendar automatic watch. Features a blue dial with silver-tone hands and index hour markers, minute markers on the bezel. Equipped with luminous markers for night readability. Movement is Calibre 5134 Automatic, based on Audemarts Piguet 2120 calibre, containing 38 jewels and composed of approximately 374 parts, beating at 19800 vph rate, offering around 40 hours power reserve. Case and bracelet are crafted from grey titanium with a fixed grey titanium bezel. Scratch resistant sapphire crystal face and transparent caseback allow visibility of the movement. The octagonal shaped case measures 41mm in diameter. Secured by a deployment clasp. Water resistant to 20 meters (66 feet). Includes perpetual calendar, moon phase display, day of the week, month/leap year indicator, date function, casual style.