Seiko Watchesのインスタグラム(seikowatchusa) - 12月4日 08時32分

Seiko’s Spring Drive is an exclusive movement that achieves an unprecedented level of accuracy (+/- 15 seconds per month on average, equivalent to +/- 1 second per day) by regulating mechanical watches with state-of-the-art electronic technology that functions without batteries of any kind.
Ref. SBGA083
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[BIHAKUEN]UVシールド(UVShield)

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