Seiko 9R01

Caliber 9R01 is a manual-winding Spring Drive movement manufactured by Seiko and introduced in 2016. It achieves an eight-day power reserve through twin barrels, distinguishing it within the 9R family. The movement is assembled and adjusted by hand at Grand Seiko's Shizukuishi studio, reflecting the brand's in-house manufacturing. It remains in production and serves as the base for several Grand Seiko Heritage Collection references.