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The SPB475 is a 500-piece U.S. limited edition reissue of Seiko's 1968 diver, built around caliber 6R54 — the brand's first mechanical GMT made for diving. It pairs a 200 m ISO-rated stainless steel case with a black ceramic unidirectional bezel, sapphire crystal and a blue-green graduated dial. The independent GMT hand tracks a second time zone without disturbing local time, and the movement runs about 72 hours on a full wind. It suits collectors and frequent travelers who want a true dive watch with GMT utility; against standard Prospex divers it adds the GMT complication and ceramic bezel, while costing more than non-limited 6R35 models.
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Owners of the 6R54 Prospex GMTs praise the long power reserve, the smooth independent GMT setting and the ceramic bezel's feel. Some note the movement runs within normal automatic tolerances rather than tight chronometer spec, and a few find the graduated dial busier than a plain one.
The Seiko Prospex 1968 Heritage Diver's GMT U.S. Limited Edition honors Seiko's landmark 1968 Diver's Watch. It is a controlled production run of 500 pieces. It uses caliber 6R54, Seiko's first mechanical GMT movement created for diving.
The dial has a vertical gradation in blue-green that reflects the view from above and below the water. It has a date calendar, a bronze-tone GMT hand, and large LumiBrite markers and hands. A black ceramic uni-directional rotating bezel with a knurled edge frames the dial. The bezel is made in Japan.
The 24-jewel automatic movement can also be wound by hand. It has a power reserve of approximately 72 hours, the longest of any Seiko mechanical watch. The GMT hand can be set independently in one-hour steps without interrupting the time-of-day hands, so a second time zone is easy to read. The watch follows ISO standards for scuba diving and is water resistant to 200 meters.
