Seiko Prospex x Automatic ft. Samurai aka Great White Shark aka Save The Ocean (STO) (Special Edition) Men Diver Round 200m Water Resistant Watch SRPD23K1 SRPD23 SRPD-23 SRPD-23K1 Seiko Prospex Save The Ocean SRPD23K1 - Special Edition 200m diver watch with Great White Shark motif. Features iconic Samurai case design (43.8mm), lumibrite markers, and stainless steel bracelet with extender. Powered by 4R35 automatic movement (41h power reserve) with screw-down crown. Supports marine conservation with unique case back engraving. Caliber Number / Movement 4R35 (automatic with manual winding capacity) Power Reserve / Accuracy Approximately 41 hours (+45 to -35 seconds per day) Crystal Hardlex crystal Luminous LumiBrite on hands, indexes and bezel Case / Band Material Stainless steel case with stainless steel band (three-fold clasp with secure lock, push-button release with extender) Water Resistance 200m / 660ft diver Case Size Thickness: 13.4 mm Diameter: 43.8 mm Length: 48.4 mm Lug width: 22.0 mm Other Specifications Seiko Prospex x Automatic ft. Samurai aka Great White Shark aka Save The Ocean (STO) (Special Edition) SPECIAL EDITION on the case back Unidirectional rotating bezel Screw-down crown Screw case back 23 jewels Date display Stop second hand function (hacking mechanism) Regular timekeeping (analog display)