Steel Rolex Oyster Perpetual Seadweller. 1980's model. Automatic chronometer movement. Brushed and polished steel case 40mm diameter water resistant to1,220 meters/4,000 feet. Black Swiss - T 25 dial. Steel Oyster Lock bracelet. Rolex model number 16660. Box and service papers only dated May 2009.  Our reference S12233.