SEIKO SPB309J1 PRESAGE Sharp Edged SERIES Open Heart Automatic Watch

Movement Caliber Number 6R38 Movement Type Automatic with manual winding Accuracy +25 to -15 seconds per day Duration Approx. 70 hours Jewels 24 Functions Stop seconds hand function Case/Band Case Material Stainless steel (super hard coating) Case Size Thickness:11.8mm Diameter:40.2mm Lug-to-lug:47.4mm Crystal Sapphire crystal Crystal Coating Anti-reflective coating on inner surface LumiBrite Lumibrite on hands and index(es) Clasp Three-fold clasp with push button release Lug width 20 Other Details Water Resistance 10 bar Weight 161.0 Features See-through case back Screw case back See-through & Screw case back