https://www.proreviewwatch.co https://www.chronowrist.ru Since the debut of its first swiss watches replica in 1960, the pursuit of precision has been a core value of Grand Seiko. In the late 1970s, Grand Seiko began developing the Spring Drive movement, aiming to perfectly blend the power of a traditional mainspring with the most advanced electronic watchmaking technology of the time. Upholding this relentless pursuit of precision, Grand Seiko proudly unveiled the Spring Drive 9RB2 movement at Watches & Wonders Geneva in 2025. This groundbreaking movement, awarded the UFA (Ultra-Precision) designation, boasts an annual error of only ±20 seconds, making it arguably the most accurate mainspring-driven watch movement available today.