Seiko SPB159 Automatic Watch DetailsThis automatic watch features a gradated black dial. It is paired with a curved sapphire crystal with anti-reflective coating on the inner surface.Additional technical details include a power reserve of approximately 70 hours, 24 jewels, and a date calendar.Specifications Movement: Manual and automatic winding 21,600 vibrations per hour Power reserve: approximately 70 hours 24 jewels Gradated black dial Date calendar LumiBrite hands and markers Curved sapphire crystal with anti-reflective coating on the inner surface Screwdown crown and see-through caseback Case diameter: 38.0 mm Stainless steel case Gray leather strap Tri-fold clasp with push button release Water resistance: 20 bar, 200 meters (660 feet) Caliber: 6R35 Included with your purchase: 3-year SEIKO USA warranty card included.