Seiko Prospex x Automatic ft. Sumo Men Diver Round 200m Water Resistant Watch SPB103J1 SPB103 SPB-103 SPB-103J1 Discover the Seiko Sumo, a bold watch that combines striking design with exceptional craftsmanship. Its 45mm stainless steel case offers a robust yet comfortable fit, complemented by a uni-directional rotating bezel. Powered by the reliable Caliber 6R35 automatic movement, it boasts a 70-hour power reserve and smooth operation. The sapphire crystal dial features lumibrite hands for low-light visibility and a practical date function. With 200 meters of water resistance, this watch is perfect for any adventure, making it a favorite among enthusiasts. Caliber Number / Movement 6R35 (automatic with manual winding capacity) Power Reserve / Accuracy Approximately 70 hours (+25 to -15 seconds per day) Crystal Sapphire 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: 12.9 mm Diameter: 45.0 mm Length: 52.6 mm Lug width: 20.0 mm Other Specifications Seiko Prospex x Automatic ft. Sumo Made in Japan Unidirectional rotating bezel Screw-down crown Screw case back 24 jewels Date display Stop second hand function (hacking mechanism) Regular timekeeping (analog display)