Seiko Prospex x Automatic ft. 1968 Heritage Modern Re-Interpretation aka Marinemaster GMT (Limited Edition of 6,000 Pieces) Men Diver Round 300m Water Resistant Watch SPB509J1 SPB509 SPB-509 SPB-509J1 Honor Seiko diving legacy with the limited edition Prospex 1968 Heritage Diver GMT. Features a wave-textured dial, upgraded 300m water resistance, and GMT Caliber 6R54. Innovative clasp offers 15mm micro-adjustment for diving comfort. A perfect blend of vintage inspiration and modern dive watch technology for collectors and professionals. 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 slide extender) Water Resistance 300m / 1,000ft diver Case Size Thickness: 13.3 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-Interpretation aka Marinemaster GMT (Limited Edition of 6,000 Pieces) Made in Japan LIMITED EDITION on the case back Serial number engraved on the case back 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)