Grand Seiko unveils its most accurate automatic diver's watch with the Spring Drive U.F.A. Ushio 300 Diver

manofmany.com

Grand Seiko's new diver's watch boasts the most accurate automatic movement ever created. The Spring Drive U.F.A. Ushio 300 Diver features Calibre 9RB1 with an "Ultra Fine Accuracy" of ±20 seconds per year, housed in a lighter, smaller titanium case. This watch offers professional-grade 300-meter water resistance and is available in blue or green gradient dials, launching in June 2026.


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Grand Seiko unveils its most accurate automatic diver's watch with the Spring Drive U.F.A. Ushio 300 Diver | News Minimalist