Grand Seiko Debuts New 40mm Spring Drive U.F.A. Ushio 300 Diver
Grand Seiko introduced its revolutionary Spring Drive Caliber 9RB2 just over a year ago, at Watches & Wonders 2025 in Geneva. It was notable as the first movement from the Japanese high-horology house to achieve its new “U.F.A.” designation, whose initials stand for “Ultra Fine Accuracy.” The...
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