Seiko Prospex challenges every limit, with a collection of timepieces for sports lovers and adventure seekers whether in the water, in the sky or on land. Since launching Japan’s first diver’s watch in 1965, Seiko’s innovative technology has changed global standards. We are constantly striving to bring ever greater reliability and safety to both professional and recreational divers. Specifications: Movement Caliber Number 4R36 Movement Type Automatic with manual winding Duration Approx. 41 hours Exterior Case Material Stainless steel Crystal Sapphire crystal Crystal Coating Anti-reflective coating on inner surface 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: 13.2 ㎜Diameter: 45 ㎜Length: 47.7 ㎜ Weight 198.0 g Other Specifications Screw case back Screw-down crown SPECIAL EDITION on the case back Three-fold clasp with secure lock Unidirectional rotating bezel Other Features 24 jewels Day/Date display Stop seconds hand function