Grand Seiko reveals the T0 Constant-force Tourbillon concept movement

Grand Seiko introduced today its first-ever concept creation since the introduction of the first Grand Seiko in the 1960s. The new T0 (T-zero) Constant-force Tourbillon incorporates a fully integrated constant-force mechanism and tourbillon on the same axis for the first time in the world.

Always pursuing the highest possible accuracy has the fundamental value of its timepieces, Grand Seiko introduced today its first-ever concept creation since the introduction of the first Grand Seiko in the 1960s.

The new T0 (T-zero) Constant-force Tourbillon incorporates a fully integrated constant-force mechanism and tourbillon on the same axis for the first time in the world.

The constant-force mechanism provides even energy distribution to the escapement regardless of how much the mainspring is wound, and the tourbillon eliminates the error in precision caused by gravity by incorporating the escapement parts and balance in a rotating carriage.

A true technical feat, the integration of the mechanisms as one unit is a patented design that achieves a new level of accuracy for Grand Seiko's mechanical watchmaking.

It is interesting to mention that the designers conceptualized the new creation without restrictions from production capability considerations. This free approach to development resulted in the birth of T0 and inspired essential movement parts for the new Caliber 9SA5, which was developed in parallel with the concept creation.

The T0 is also characterized by its ticking sound. An escapement ticks eight times per second if a watch has 28,800 vibrations/hour. In the case of T0, the ticking sounds like a 16th note feel, accompanied by the impact sound of a constant-force every second. T0 achieves the perfect 16th note ticking sound with a ceramic stop wheel processed in precision at a micron level and the mechanism for finely regulating the timing of action. Discover more at grand-seiko.com