Prospex Stainless Steel Automatic Watch SRPG21 Prospex PADI Special Edition Special Edition celebrating the partnership between Seiko Prospex and PADI, the world's leading scuba diver training organization Black deep 3-D pressed pattern dial Automatic diver with manual winding capability 21,600 vibrations per hour Power reserve: approximately 41 hours 23 jewels Black ceramic uni-directional rotating elapsed timing bezel with bright blue accents 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-resistant to 200 meters (660 feet), Diver's Watch. Follows ISO standards and is suitable for scuba diving Caliber 4R35