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Amazon.com: Mens Grand Seiko Spring Drive Movement, Blue Snowflake Dial SBGA407 : Grand Seiko: Clothing, Shoes & Jewelry
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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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Grand Seiko Spring Drive 8-Days and what's so "Seiko" about the Spring Drive technology - Monochrome Watches
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