This limited edition watch is designed to commemorate the 20th anniversary of the original Spring Drive movement, Caliber 9R, by Grand Seiko (introduced in 2004). The dial's gradient reflects the moment when the sun begins to rise, inspired by the birthplace of the Spring Drive, the steep landscapes of the Suwa region. As the steep terrain of the Hodaka mountains turns a vivid crimson, the light shines on the autumn leaves, emerging from the darkness of dawn. This beautiful scene is expressed by the gradual brightening from the deep red at the edge of the dial towards the center.
The manual-winding Caliber 9R31 is equipped with an innovative dual mainspring barrel, containing two parallel mainsprings, providing a power reserve of 72 hours.