Grand Seiko has created a mechanical movement capable of such precision timekeeping the company has created its own Ultra Fine Accuracy certification, or UFA, as it will be shown on dials that meet the standard. The Spring Drive Caliber 9RB2 is an automatic movement that Grand Seiko says is accurate to +/-20 seconds per year. … Continue reading Grand Seiko makes world’s most accurate watch with a mainspring for less than $11,000