Automatic Diver. Manual and automatic winding capabilities. Power reserve: approximately 41 hours. LumiBrite hands and markers. SRPE37 From the Prospex Collection Automatic Diver Manual and automatic winding capabilities 21,600 vibrations per hour Power reserve: approximately 41 hours 23 jewels Black ceramic one-way rotating elapsed timing bezel White dial with 3-D pressed pattern reflecting the bezel edge shape Magnified date calendar LumiBrite hands and markers Sapphire crystal with anti-reflective coating on the inner surface Screwdown crown and caseback Case diameter: 44.0mm Stainless steel case Black silicone strap Water Resistance: Diver's Watch 200 meters (660 feet). Follows ISO standards and is suitable for scuba diving Caliber 4R35