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Grand Seiko’s famed Spring Drive calibres have long set the standard for mainspring-powered timekeeping, but at Watches & Wonders 2025, the Japanese watchmaker announced its most accurate Spring Drive movement ever. Among its new watches this year, Grand Seiko will debut the SLGB001 and SLGB003, both powered by the new “Ultra Fine Accuracy” Spring Drive Caliber 9RB2, improving accuracy from ±15 seconds per month to ±20 seconds per year.
In addition to this technical revolution,…
