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Hands-On: Grand Seiko SBGE255 Spring Drive GMT In New Smaller 40.5mm Case With Ceramic Bezel | aBlogtoWatch
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Seiko - Spring Drive Accuracy. A brief examination for real performance and long answer of if it matters.
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Slimmer, more precise and more powerful. A new Spring Drive movement marks a new beginning for Grand Seiko. | Grand Seiko
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