Audemars Piguet Royal Oak Double Balance Wheel Openworked 15407ST.OO.1220ST.01.
Stainless steel 41mm case. Sapphire crystal and caseback, screw locked down. Water-resistant to 50 meters. Self-winding movement. Hours, minutes, centre seconds. 38 Jewels. Slate grey openworked dial with pink gold hour-markers and luminescent hands. Calibre 3132. 45-hour power reserve. 245 Parts. 3,00 Hz 21'600 vibrations/hour. Stainless steel bracelet with folding clasp.