With the Kodo Constant-force Tourbillon, Grand Seiko demonstrated its outstanding technical expertise at Watches and Wonders 2022. With a charming understatement, the Japanese luxury watch brand called this mechanical masterpiece its “first mechanical complication.” Well, its two sophisticated mechanisms, originally designed to improve the accuracy of timekeeping, combined in a single unit on a single axis for the first time in history, took the watch world by storm and was awarded the Chronometry Prize at that year’s Grand Prix d’Horlogerie de Genève.

The key to its high accuracy is the design of the two mechanisms on one axis. Since there are no wheels or other components between them, there is no loss or change in the torque transmitted from the constant-force mechanism to the balance wheel, resulting in a highly stable amplitude of the balance. While the leitmotif of the first Kodo was the twilight in the evening hours, expressed through the interplay of light and shadow that is central to Grand Seiko’s aesthetic, the new SLGT005G, introduced at this year’s Watches and Wonders, uses these elements to evoke daybreak.
The delicate moment when the morning light begins to reclaim the sky inspired Grand Seiko to create the new edition of the Kodo. This aura is emphasized throughout the open design, completing a portrayal of light and shadow. The movement components, meticulously hand-polished, have a silver tone, giving the ne...