From Seiko, the Men's Prospex Automatic Watch features:  1959 sport watch reinterpretation Gradated green dial Stainless steel case and bracelet LumiBrite hands and markers Curved sapphire crystal with anti-reflective coating on the inner surface Manual and automatic winding capabilities Tri-fold push button release clasp Approx. 21,600 vibrations per hour Power reserve approx. 70 hours 24 jewels Date calendar Screw down crown and see-through case back Case diameter approx. 38.0mm Water Resistance: Up to 20 bar, 200 meters (660 feet)  Imported.