Seiko Prospex x Automatic ft. Mini Antarctica Tuna aka Save The Ocean (STO) (Special Edition) Men Diver Round 200m Water Resistant Watch SRPH77K1 SRPH77 SRPH-77 SRPH-77K1 Discover the Seiko SRPH77K1 Save The Ocean Tuna dive watch, featuring a 43.2mm case with iconic shroud design and 200m water resistance. Powered by an automatic movement with a stunning ombre blue penguin-engraved dial and contrasting yellow seconds hand. Includes date window and comfortable blue rubber strap. 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 silicone band Water Resistance 200m / 660ft diver Case Size Thickness: 12.6 mm Diameter: 43.2 mm Length: 44.0 mm Lug width: 20.0 mm Other Specifications Seiko Prospex x Automatic ft. Mini Antarctica Tuna 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)