Grand Seiko Caliber T0 (T-Zero)

The Grand Seiko caliber T0 (aka T-Zero) is a constant force tourbillon watch movement. The caliber T0 was announced to the world on September, 2, 2020 and is the first tourbillon movement to be released by Grand Seiko. It is also Grand Seiko’s first attempt at creating a constant force mechanism. This is a concept caliber produced by a design team lead by Takuma Kawauchiya and is not currently available in any Grand Seiko models (there are no finished watches with this caliber). The movement is on display in Morioka, Japan at the Grand Seiko Studio Shizukuishi. In Grand Seiko’s own words: “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.” -Grand Seiko “Seiko Watch Corporation revealed the T0 (T-zero) Constant-force Tourbillon (abbreviated as “T0″) as a concept creation of Grand Seiko in September 2020. With this new movement, Grand Seiko returned to the top in the world.” -Grand Seiko GS also says the T0 movement is “…intended to elevate precision with a complicated mechanism to pursue further accuracy without consideration of mass production.

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