18 carat yellow gold case with a 18 carat yellow gold bracelet. Slate grey skeleton dial with gold-tone hands. Minute markers around the outer rim. Dial Type: Analog. Luminescent hands and markers. Hand wind movement. Calibre 2924 openworked manufacture engine. Scratch resistant sapphire crystal. Skeleton transparent exhibition see through case back. Case diameter: 41 mm. Case thickness: 8.95 mm. Round case shape. Deployment with push button clasp. Water resistant at 200 meters / 660 feet. Functions: Tourbillon, Hour, Minute, Power Reserve Indicator. Luxury watch style. Watch label: Swiss Made. Audemars Piguet Royal Oak Tourbillion Extra- Thin Slate Grey Skeleton Dial 18 Carat Yellow Gold Mens Watch 26513BA.OO.1220BA.01.