Seiko 5 Sports x Automatic ft. Field Series Men Formal Round 100m Water Resistant Watch SRPG27K1 SRPG27 SRPG-27 SRPG-27K1 Discover the rugged versatility of the Seiko 5 Sports Field - a 100m water-resistant automatic watch with 39.4mm stainless steel case and hardlex crystal. Features LumiBrite illumination, day-date display, and 41-hour power reserve. Built for adventure with magnetic resistance and exhibition case back. 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 stainless steel band (three-fold clasp with secure lock, push-button release) 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)