Seiko SRPE99 Prospex DiverSpecifications 200m 660 ft diver's Mechanical Movement Caliber Number 4R36 Movement Type Automatic with manual winding Duration Approx. 41 hours Exterior Case Material Stainless steel Crystal Hardlex LumiBrite Lumibrite on hands, indexes and bezel Clasp Three fold clasp with secure lock , push button release with extender Other Details Water Resistance 200m 660ft diver's Case Size Thickness: 13. 4 Diameter: 45 Weight 195. 0 g Other Specifications