Seiko 5 Sports x Automatic ft. Field Series Men Formal Round 100m Water Resistant Watch SRPH31K1 SRPH31 SRPH-31 SRPH-31K1 Discover the rugged Seiko 5 Sports Field Series automatic watch, designed for durability and precision. Its 39.4mm stainless steel case houses the reliable 4R36 movement with 41-hour power reserve, day-date display, and 100m water resistance. Enhanced with magnetic resistance, LumiBrite illumination, and a curved hardlex crystal. Caliber Number / Movement 4R36 (automatic with manual winding capacity) Power Reserve / Accuracy Approximately 41 hours (+45 to -35 seconds per day) Crystal Hardlex crystal (curved) Luminous LumiBrite on hands and indexes Case / Band Material Stainless steel case with leather (nylon) band Water Resistance 100m / 10 bar Case Size Thickness: 13.2 mm Diameter: 39.4 mm Length: 48.1 mm Lug width: 20.0 mm Other Specifications Seiko 5 Sports x Automatic ft. Field Series Magnetic resistance (4,800 A/m) See-through back case Screw case back 24 jewels Day and date display Stop second hand function (hacking mechanism) Regular timekeeping (analog display)
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