Seiko Prospex watches are designed 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 dive watch standards. The case construction and design of this modern re-interpretation of Seiko\'s 1968 diver\'s watch is faithful to the original with cut away sides for a snug, comfortable fit on any wrist. The re-designed dial layout with arrow shaped hour and sharp minute hands alongside differentiated markers at 12, 6 and 9 provide high legibility at depth. Every detail is high quality with Zaratsu polishing adding a refined beauty and sharpness to the lugs and sapphire crystal glass for durability. The accordion-style silicone strap combines high durability and comfort - a strap design invented by Seiko in 1975 as a practical solution to the expansion and contraction of a diver\'s wrist at different depths. Caliber Number4R36Movement Type Automatic with manual winding Duration Approx 41 hours Case Material Stainless Steel Crystal Hardlex Lumibrite Lumibrite on hands and indexes Band Material Silicone Water Resistance200 Metres Case Size Thickness: 13. 4mm Diameter: 45mm Weight124g Other Specifications- Screw case back- Screw-down crown- Unidirectional rotating bezel Other Features- 24 jewels- Day/Date display- Stop seconds hand function