Audemars Piguet Royal Oak Offshore 26020ST.OO.D101CR.01. "F" Series . AP In-house Automatic Movement, stainless steel case 42mm fitted with a brand new custom made black croco leather strap and stainless steel deployant buckle. Water resistant up to 100 m, screw down crown and Sapphire crystal. Diameter is 44mm. Date, hours, seconds, minutes, and chronograph functions. Caliber 2326/2840. With Box & Cert Undated, Local AD.