Bulova Wilton 60 Hour Power Reserve Automatic Stainless steel screw-back case, textured black three-hand dial with silver-tone Roman numerals/markers and round dial aperture offering a glimpse of the self-winding 21-jewel heartbeat movement with 60 hours of reserve power, domed sapphire crystal with anti-reflective coating, black leather strap with push-button deployant buckle, and water resistance to 100 meters. Diameter: 42mm Thickness: 12. 7mm Domed sapphire crystal with anti-reflective coating, black leather strap with push-button deployant buckle, and water resistance to 100 meters. Analog-quartz Movement Case Diameter: 42mm Water resistant to 100m (330ft): in general, suitable for swimming and snorkeling, but not diving Stainless steel screw-back case, textured black three-hand dial with silver-tone Roman numerals/markers and round dial aperture offering a glimpse of the self-winding 21-jewel heartbeat movement.