Seiko SRPB55K1 Men Prospex Automatic Diver’s 200M Watch. Japan made automatic movement. Calibre 4R35. 23 jewels. Power reserve: 41 hours. 21,600 vibrations per hour. Dark-grey ion-plated stainless steel case. Unidirectional rotating bezel. Black silicone strap. Dark-grey dial with luminous hands and hour markers. Date display at 3 o’clock position. Screw case back. Screw-down crown. Hardlex glass. Water resistance up to 200 meters for diving. Approximate case diameter: 43.8mm.