Movement Caliber Breitling B31 (Manufacture) Movement Self-winding mechanical Power Reserve Approx. 78 hrs Vibration 28,800 v.p.h Calendar Dial aperture Case Case Material Stainless steel & 18k red gold Water Resistance 200 m (660 ft) Crystal Cambered sapphire, glareproofed both sides Dimensions Product Weight (Approx.) 153.3 g Watch Head Weight (Approx.) 72.7 g Diameter 42 mm Lug Width (in-between lugs) 22.05 mm Strap Strap Material Stainless steel