Calibre Calibre no. 6N01 Movement Type Quartz Accuracy ±15 seconds per month Power Reserve/Battery Life Approx. 3 years Case Case Material Stainless steel Crystal Sapphire crystal Clasp Three-fold clasp with push button release LumiBrite Lumibrite on hands and index(es) Case Size Thickness: 8.7mm Diameter: 34.0mm Lug to lug: 40.8mm Layout Water Resistance 20 bar Other Specifications Screw case back