Seiko Presage x Automatic ft. Sharp Edged Series aka Open Heart Men Formal Round 100m Water Resistant Watch SPB309J1 SPB309 SPB-309 SPB-309J1 Discover the Seiko Presage Sharp Edged Series, featuring a 40.2mm stainless steel case, geometric Asanoha-pattern dial, and the 6R38 movement (70h power reserve). With sapphire crystal, 100m water resistance, and elegant bracelet, this watches blend Japanese craftsmanship with contemporary dress watch sophistication. Caliber Number / Movement 6R38 (automatic with manual winding capacity) Power Reserve / Accuracy Approximately 70 hours (+25 to -15 seconds per day) Crystal Sapphire crystal (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: 11.8 mm Diameter: 40.2 mm Length: 47.4 mm Lug width: 20.0 mm Other Specifications Seiko Presage x Automatic ft. Sharp Edged Series aka Open Heart Made in Japan See-through case back Screw case back 24 jewels Stop second hand function (hacking mechanism) Regular timekeeping (analog display)
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