06 Aug Grand Seiko’s newest Caliber: 9RB2 Ultra Fine Accuracy (UFA)
Posted at 16:15h
in News & Events
A new era of accuracy from Grand Seiko - Caliber 9RB2 - Ultra Fine Accuracy (U.F.A.) The Caliber 9RB2 introduces the Ultra Fine Accuracy (U.F.A.) designation, achieving an extraordinary annual precision of ±20 seconds—the most accurate mainspring-powered movement ever created (as of April 2025, based on...