Rolex Pre-Owned Explorer II Series. Model number BKSO (16570). Automatic mechanical movement. Analog dial with black face, silver-tone hour markers and hands featuring luminescent coating. Minute markers on the outer bezel ring. Includes date display at the 3 o'clock position. Sapphire crystal provides scratch resistance. Fixed stainless steel bezel engraved for 24-hour marks. Silver-tone stainless steel case and oyster bracelet secured by a fold over clasp with safety release system. Water resistant up to 100 meters / 330 feet.