SEIKO PROSPEX SFK001J1 SUMO AQUA GMT SOLAR GENT'S WATCH SPECIFICATIONS : Caliber Number : 5K65 Movement Type : Solar Precision : ±15 seconds per month 3 Jewels Overcharge prevention function Quick-start function 24-hour hand Date display Case Material : Stainless steel Case Thickness : 13.2mm Case Diameter : 45.0mm Lug-to-lug : 51.8mm Sapphire crystal Anti-reflective coating on inner surface LumiBrite on hands, index(es) and bezel Three-fold clasp with secure lock , push button release with extender Bracelet Length : 200.0 Distance between lugs : 20 Water Resistance : 200m / 660ft diver's Magnetic Resistance : 4,800 A/m Unidirectional rotating bezel Screw-down crown Three-fold clasp with secure lock Screw case back