Seiko 5 Sports x Automatic ft. SKX Series Men Formal Round 100m Water Resistant Watch SRPE51K1 SRPE51 SRPE-51 SRPE-51K1 The Seiko SRPE series blends classic SKX DNA with modern dress watch elegance. Featuring a 40mm stainless steel case, hardlex crystal, and reliable 4R36 automatic movement, this versatile timepiece offers day/date display and 100m water resistance. Perfect for both casual and formal occasions. 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 and indexes Case / Band Material Stainless steel case with stainless steel band (three-fold clasp with push-button release) Water Resistance 100m / 10 bar Case Size Thickness: 11.5 mm Diameter: 40.0 mm Length: 44.6 mm Lug width: 20.0 mm Other Specifications Seiko 5 Sports x Automatic ft. SKX Series See-through back case Screw case back 24 jewels Day and date display Stop second hand function (hacking mechanism) Regular timekeeping (analog display)