Steel Rolex Oyster Perpetual Sea-Dweller 4000 116600. Automatic chronometer movement. Brushed and polished steel case 40mm diameter, water resistant to 1,220 meters 4,000 feet. Black dial with index hour markers. Ceramic Bezel. Steel Oyster bracelet with safety catch, fliplock and Glidelock extensions. Box and papers dated March 2016. Our reference S20341.