Audemars Piguet Royal Oak Selfwinding Ref. 15550BA.OO.1356BA.02 The Audemars Piguet Royal Oak Selfwinding ref. 15550BA.OO.1356BA.02 has a 37 mm 18-carat yellow gold case and the self-winding Calibre 5909. - Self-winding Calibre 5909, 60 h power reserve - Functions: hours, minutes and centre seconds - Case: 18-carat yellow gold case, glareproofed sapphire crystal and caseback. Diameter 37 mm, thickness 9.1 mm, water resistant to 50 m - Dial: yellow gold dial with vertical satin-finishing, yellow gold Royal Oak hands with luminescent coating - 18-carat yellow gold bracelet with AP folding clasp Full set. Maker: Audemars Piguet. Reference: 15550BA.OO.1356BA.02. Available through ELITA's private desk — verification review, discreet handling and storage. Price on request.