Seiko Prospex x Automatic ft. 1970 Heritage aka Captain Willard Reissue aka Save The Ocean (STO) (Special Edition) Men Diver Tonneau 200m Water Resistant Watch SPB301J1 SPB301 SPB-301 SPB-301J1 The Seiko Prospex SPB301 redefines modern diving with its 42mm stainless steel case, bold silver dial, and robust 6R35 movement (70h power reserve). Featuring 200m water resistance, a unidirectional bezel, and lumibrite markers, this professional-grade tool watch blends rugged functionality with sleek, contemporary aesthetics for serious adventurers. Caliber Number / Movement 6R35 (automatic with manual winding capacity) Power Reserve / Accuracy Approximately 70 hours (+25 to -15 seconds per day) Crystal Sapphire crystal (curved, anti-reflective coating) 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: 13.2 mm Diameter: 42.7 mm Length: 46.4 mm Lug width: 20.0 mm Other Specifications Seiko Prospex x Automatic ft. 1970 Heritage aka Captain Willard Reissue aka Save The Ocean (STO) (Special Edition) Made in Japan SPECIAL EDITION on the case back Unidirectional rotating bezel Screw-down crown Screw case back 24 jewels Date display Stop second hand function (hacking mechanism) Regular timekeeping (analog display)