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 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 blue anti-reflective coating, black leather strap with push-button deployant buckle, and water resistance to 100 meters. Diameter: 42mm Thickness: 12.7mm