ROYAL OAK PERPETUAL CALENDAR “JOHN MAYER” LIMITED EDITION OF 200 Ref. 26574BC.OO.1220BC.02 CASE 18-carat white gold case, glareproofed sapphire crystal and caseback. SIZE 41 mm THICKNESS 9.5 mm WATER RESISTANCE 20 m DIAL Blue “Crystal Sky” finished dial, white gold applied hour-markers and Royal Oak hands with luminescent coating. BRACELET 18-carat white gold bracelet with AP folding clasp.