Audemars Piguet Royal Oak Offshore, model AP 298567-49. Pre-owned with original papers included. Case: black stainless steel and sapphire crystal. Diameter: 42mm round face. Fixed bezel features tachymeter function. Dial display includes central hours, minutes, seconds subdials for chronograph functions, day, date window and counters. Case back is skeleton design screw-down type. Equipped with a rubber strap secured by tang buckle.