Seiko Prospex x Automatic ft. 1968 Heritage Modern Re-Intepretation aka Marinemaster GMT Men Diver Round 200m Water Resistant Watch SPB381J1 SPB381 SPB-381 SPB-381J1 Discover the Seiko Prospex GMT dive watches, designed for adventurers and watch enthusiasts alike. These timepieces combine robust functionality with elegant aesthetics, featuring a reliable GMT function, luminous hands, and a water resistance of up to 200 meters. Perfect for both underwater exploration and everyday wear, the Seiko Prospex series showcases exceptional craftsmanship and innovative technology, making it a must-have for any collection. Caliber Number / Movement 6R54 (automatic with manual winding capacity) Power Reserve / Accuracy Approximately 72 hours (+25 to -15 seconds per day) Crystal Sapphire crystal (anti-reflective coating) Luminous LumiBrite on hands, indexes and bezel Case / Band Material Stainless steel (super hard coating) case, ceramic bezel insert with stainless steel band (three-fold clasp with secure lock, push-button release with extender) Water Resistance 200m / 660ft diver Case Size Thickness: 12.9 mm Diameter: 42.0 mm Length: 48.6 mm Lug width: 20.0 mm Other Specifications Seiko Prospex x Automatic ft. 1968 Heritage Modern Re-Intepretation aka Marinemaster GMT Made in Japan Magnetic resistance (4,800 A/m) Unidirectional rotating bezel Screw-down crown Screw case back 24 jewels Date and 24-hour (GMT dual time) display Stop second hand function (hacking mechanism) Regular timekeeping (analog display)