Grand Seiko (@grandseikoofficial) has introduced the Evolution 9 Collection, two new divers’ watches powered by a new Spring Drive U.F.A. movement, Calibre 9RB1.
The 9RB1 movement is hand-assembled by the highly skilled craftsmen and women of the Shinshu Watch Studio, located in a Seiko Epson facility in the city of Shiojiri in Nagano Prefecture.
The movement’s annual accuracy of ±20 seconds is achieved by vacuum-sealing the crystal oscillator, which has been stabilised through a three-month a
