The Audemars Piguet Royal Oak Double Balance Wheel Openworked ref. 15407ST.OO.1220ST.01 is cased in stainless steel, with an openworked slate dial revealing the double balance wheel. Self-winding calibre 3132 with double balance wheel; 41 mm stainless steel case; Integrated steel bracelet. Full set. Photographed: the actual piece. Maker: Audemars Piguet. Reference: 15407ST.OO.1220ST.01. Available through ELITA's private desk — verification review, discreet handling and storage. Price on request. Case Size: 41 mm. Case Material: Stainless steel. Movement: Self-winding — Calibre 3132. Bracelet/Strap: Stainless steel bracelet, AP folding clasp.