Seiko Prospex 1968 Heritage Diver's GMT. This re-interpretation of Seiko's landmark 1968 diver's watch features the brand's first mechanical GMT movement in a diver's watch—caliber 6R54 with 24 jewels, 72-hour power reserve, and manual winding. Key specifications: Independent GMT hand adjustable in one-hour increments. Green ceramic uni-directional rotating bezel with knurled edge. Green dial with date calendar, gold GMT hand, and LumiBrite markers. Stainless steel case with super-hard coating. 300-meter water resistance. Anti-reflective sapphire crystal. Screwdown crown and caseback. Three-link bracelet with slide adjuster clasp. Made in Japan. A superbly functional timepiece engineered for superior style and performance on the sea, sky, or land.