Seiko Prospex x Automatic ft. Speedtimer Chronograph Men Formal Round 100m Water Resistant Watch SRQ037J1 SRQ037 SRQ-037 SRQ-037J1 Discover the Seiko Prospex Speedtimer Chronograph featuring the advanced 8R46 automatic movement with column wheel and vertical clutch for precise timing. Includes a 45-hour power reserve, super-hard coated stainless steel case, charcoal gray dial with beige LumiBrite, and dual-curved sapphire crystal. 100m water resistant. Caliber Number / Movement 8R46 (automatic with manual winding capacity) Power Reserve / Accuracy Approximately 45 hours (+25 to -15 seconds per day) Crystal Sapphire crystal (dual curved, anti-reflective coating) Luminous LumiBrite on hands and indexes Case / Band Material Stainless steel (super hard coating) case with stainless steel band (three-fold clasp with push button release) Water Resistance 100m / 10 bar Case Size Thickness: 15.1 mm Diameter: 42.5 mm Length: 50.0 mm Lug width: 20.0 mm Other Specifications Seiko Prospex x Automatic ft. Speedtimer Chronograph Made in Japan See-through case back Screw case back 34 jewels Date display Chronograph up to 30 minutes in 1/8-second increment Equipped with small second hand Stop second hand function (hacking mechanism) Regular timekeeping (analog display)