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The Seiko caliber 4R36 is an automatic used by Seiko Watch Corp.

 

From:
calibercorner.com
The Seiko caliber 4R36 is an automatic used by Seiko Watch Corp. in their own branded watches. This movement was released circa 2011. This caliber was considered to be an upgrade from the popular 7S36 movement as it offers the user the desirable hacking and hand-winding functionality.

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