Steel Grey Seiko Prospex Sumo Automatic SPB101J1 Watch with Black Display Seiko Prospex Sumo Automatic is a high-quality diver's watch with a water-resistance of 200 meters and a screw-lockable knob at 4 o'clock. The large watch case is 45 mm wide and made of stainless steel. The watch has a stylish black dial and bezel. The bezel features a diver's 60-minute rotating scale. The indexes and hands are heavily luminous, making the watch easy to read in the dark. The dial is protected by tough sapphire glass. This Seiko Prospex Sumo watch features a 6R35-caliber automatic movement that oscillates 21 600 times per hour and has a power reserve of up to 72 hours. Japanese Seiko watches are known for their very high technology. More than 100 years old, Seiko has pioneered the watch making industry with a number of innovations, including the first quartz watch and kinetic technology. Seiko watches combine elegance with unparalleled product development. Product number: SPB101J1Case material: stainless steelCase colour: steel greyCase diameter: 45 mmWatch thickness: 13 mmBezel material: stainless steelBezel colour: blackStrap material: stainless steelStrap colour: steel greyStrap width: 20 mmStrap length: 160-210 mmDial colour: blackGlass: sapphire glassDate displayWater resistance: 200 mMovement: automaticPower reserve: up to 72 hours All Seiko watches come with a two-year warranty and are supplied in their original Seiko case. See all Seiko watches here