GS Grand Seiko

 The continuous evolution of each design

As its name implies, Spring Drive is powered by a mainspring but has a unique and very different kind of regulator that converts part of the mechanical energy generated by the unwinding of the spring to electricity and powers a crystal whose oscillations allow Spring Drive to be accurate to a second a day. The Grand Seiko Style is evident in both the “classic” Spring Drive designs from 2004 and the new hand winding dress version, designed by Kazunori Hoshino.

(left) Grand Seiko SBGA203

The smoothly flowing lines from the bezel to the case echo the grace of the glide motion of the hands. The design features a crossline layout with large wedge-shaped indexes at the 12, 6, and 9 o’clock positions and elaborately finished hairline and mirrored surfaces. Automatic Spring Drive. 41.0 mm case in stainless steel.

(right) Grand Seiko SBGY002

The manual winding Spring Drive creation that commemorates the 20th anniversary of the launch of the first Spring Drive in 1999. It challenges new frontiers with its distortion-free polish of non-uniform curves, and slim profile of just 10.2 mm. The “snowflake” dial captures the texture and look of the snow on the mountains that surround the studio where the watch is made. Caliber 9R31 with a Dual-Spring Barrel, which delivers a power reserve of about 72 hours. Manual winding. 38.5 mm case in 18k gold.