Prospex Alpinist 1959 Sport Watch Reinterpretation Automatic with manual winding capability 21,600 vibrations per hour Power reserve: approximately 70 hours 24 jewels Rotating inner compass bezel Gradated green dial Magnified date window LumiBrite hands and markers Sapphire crystal with anti-reflective coating on the inner surface Screwdown crown and see-through caseback Case diameter: 39.5mm Stainless steel case with gold finish Brown leather strap Tri-fold clasp with push button release Water-resistant to 20 bar, 200 meters (660 feet) Caliber 6R35