specification Movement Calibre Breitling 17 Movement Automatic Power reserve: Approx. 38 hours Frequency: 28,800 times/hour Number of stones: 25 Calendar Date Display Window case Case Material: Stainless Steel Case back screw-in Water resistance 500 m Bezel unidirectional, ratchet Crown screw lock, 2 gaskets Glass, domed, double-sided, non-reflective, coated sapphire crystal size Product weight, approx. 120.0 g. Watchhead weight (approx.) 95.8 g. Diameter: 42.0 mm Thickness: 13.3 mm Height (from top tip to bottom tip) 50.6 mm Lug width between lugs: 20.0 mm Straps/Bracelets Strap Material: Rubber Strap Color: Blue Strap Type: Straight Size of strap: 20/18 mm Buckle Material: Stainless Steel Buckle hole closure Buckle size: 18 mm