Specification: Caliber Number: 4R35 Movement Type: Automatic with manual winding capacity Duration: Approx. 41 hours Exterior Case Material: Stainless steel Crystal: Sapphire crystal Crystal Coating: Anti-reflective coating on inner surface LumiBrite: Lumibrite on hands, indexs 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: 12.8 ㎜ Diameter: 43.8 ㎜ Length: 48.7 ㎜ Other Specifications Screw case back Screw-down crown Three-fold clasp with secure lock Unidirectional rotating bezel Other Features 23 jewels Date display Stop second hand function