Grand Seiko’s 9R Spring Drive is the brand’s most groundbreaking movement family, and it’s one that’s totally unique to Grand Seiko. As their engineers explain it, at its most basic Spring Drive combines the best of mechanical watchmaking and the best of quartz timekeeping to create a state of the art caliber that lacks the weaknesses inherent to both of these movements. The result is a watch with quartz-like accuracy of + or - 1 second a day, coupled with the unlimited energy potential of a mechanical watch powered by a mainspring. For the full article on Worn & Wound, visit: [ Ссылка ]

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