From Seiko, the Men's Seiko 5 Sports Automatic Black Nylon Strap Watch features:  Black nylon strap Buckle closure Stainless steel case with black ion finish Black dial and unidirectional rotating bezel Day/date calendar Black hands and markers 24 jewels Manual and automatic winding capabilities Approx. 21,600 vibrations per hour Power reserve approx. 41 hours Case diameter approx. 42.5mm Water-resistant to 10 bar, 100 meters (300 feet) Imported.