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Grand Seiko Watch Mechanical GMT. SBGM021 is a mechanical GMT timepiece from Grand Seiko. Its calibre is 9S66 that performs 28 800 vibrations per hour and has 27 bearing jewels. One of its most intriguing characteristics is the mechanical automatic drive system that comes with hand winding capability. A 72 hour power reserve is available. The watch is protected from water penetration and magnetic fields. A special arrow hand indicates the second time zone. The dial features a date window positioned at the 3 o clock mark. Additional functionalities include see through case back and high definition, scratch resistant sapphire crystal glass with anti reflective coating.
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