Seiko Prospex x Automatic ft. Turtle aka Great White Shark aka Save The Ocean (STO) (Special Edition) Men Diver Tonneau 200m Water Resistant Watch SRPD21K1 SRPD21 SRPD-21 SRPD-21K1 Seiko Prospex Save The Ocean SRPD21K1 - Special Edition 200m diver watch with Great White Shark motif. Features iconic Turtle case design, lumibrite markers, unidirectional bezel, and stainless steel bracelet. Powered by 4R36 automatic movement (41h power reserve) with screw-down crown. Supports ocean conservation with unique case back engraving. Caliber Number / Movement 4R36 (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: 45.0 mm Length: 47.7 mm Lug width: 22.0 mm Other Specifications Seiko Prospex x Automatic ft. Turtle 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 24 jewels Day and date display Stop second hand function (hacking mechanism) Regular timekeeping (analog display)