Audemars Piguet Royal Oak Automatic 37mm 50th Anniversary 15550ST.OO.1356ST.04. 37 mm stainless steel case. Light blue dial with “Grande Tapisserie” pattern features date aperture at 3 o’clock. Automatic Swiss made caliber 5900, features 29 jewels, 186 parts, power reserve of 60 hours. Stainless steel bracelet with folding buckle.