T0 (T-zero) Constant-force Tourbillon

Seiko Watch Corporation revealed the T0 (T-zero) Constant-force Tourbillon (abbreviated as "T0") as a concept creation of Grand Seiko in September 2020. It represents the world's first movement with a fully integrated constant-force and tourbillon on the same axis, aiming to create a mechanical watch with the highest accuracy possible. In the 1960s, Seiko’s mechanical movements dominated top spots at the Neuchatel and Geneva Observatory Competitions, regarded as the most authoritative watch competitions then. With this new movement, Grand Seiko returned to the top in the world.