Seiko Prospex Alpinist Automatic Mens Black Dial Watch SPB117 From the Prospex CollectionModern re-imagining of Seiko's first sport watch, introduced in 1959Manual and automatic winding capabilities21,600 vibrations per hourPower reserve: approximately 70 hours24 jewelsRotating inner compass bezelBlack dialMagnified date windowLumiBrite hands and markersSapphire crystal with anti-reflective coating on the inner surfaceScrewdown crown and see-through casebackCase diameter: 39.5mmStainless steel case and braceletTri-fold push button release claspWater-resistant to 20 bar, 200 meters (660 feet)Caliber 6R35 From the Prospex Collection Modern re-imagining of Seiko's first sport watch, introduced in 1959 Manual and automatic winding capabilities 21,600 vibrations per hour Power reserve: approximately 70 hours 24 jewels Rotating inner compass bezel Black 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 and bracelet Tri-fold push button release clasp Water-resistant to 20 bar, 200 meters (660 feet) Caliber 6R35