Seiko 5 Sports Collection Inspired by vintage field/aviator style Automatic with manual winding capability 21,600 vibrations per hour Power reserve: approximately 41 hours 24 jewels Black dial 60-minute track on the outer dial 13-24 hour military time scale on inner dial Red-tipped second hand Day/date calendar Luminous hands and markers Screwdown see-through caseback Case diameter: 36.0mm Stainless steel case and bracelet Tri fold push-button release clasp Water-resistant to 10 bar, 100 meters (330 feet) Caliber 4R36