Dual-Spring Barrel

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Grand Seiko Calibe 9r31a 2

Grand Seiko Caliber 9R31

Manufacturer Grand Seiko (Seiko Watch Corporation) Caliber Number 9R31, 9R31A Movement Type Automatic, Spring Drive In-House? Yes Jewels 30 Frequency...

Grand Seiko Caliber 9sc5

Grand Seiko Caliber 9SC5

Manufacturer Grand Seiko (Seiko Watch Corporation) Caliber Number 9SC5 Movement Type Automatic, self-winding mechanical, chronograph In-House? Yes Jewels 60 Beat...

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