Grand Seikoのインスタグラム(grandseikoofficial) - 10月16日 17時47分

Spring Drive, a fusion of high technology and craftsmanship.
Spring Drive combines all that is best in both mechanical and electronic watchmaking. It delivers the one second per day precision that, until Spring Drive, only electronic watches could offer while, at the same time, offering the complete autonomy and lasting durability of the traditional automatic watch. Each Spring Drive movement has over 200 components made in-house and assembled by hand by highly skilled craftsmen and women who work with parts made to tolerances of less than one hundredth of a millimeter. At last, the best of both worlds.

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