Audemars Piguet Royal Oak Perpetual Calendar Skeleton Case: Octagonal stainless steel case with platinum bezel 950/1000, integrated stainless steel and platinum bracelet, Limited to 25 pieces;Dial: Sceletonized dial with white subdial rings, "railwaytrack" minuterie, leap year and month indications at 12 o'clock, date indication at 3 o'clock, moonphase indication at 6 o'clock, weekday indication at 9 o'clock, signed: "Audemars Piguet" ;Movement: Rhodium-plated sceletonized and engraved automatic movement with perpetual calendar ;Cal.: 2120/2802;Ref.: 25829SP.OO.0944SP.01;Movement No.: 425262;Case No.: D-86969 / No 25/25;Accessories: Box and papers, Certificate of Autheticity ;D=: 39mm;Year: 1997; Starting Bid : 100000