Grand Seiko Kodo with world-first combination of high-accuracy devices
Grand Seiko has released its first mechanical complication watch, the Kodo Constant-force Tourbillon, which is the first timepiece to combine a tourbillon and a constant-force mechanism into a single axis for greater stability and accuracy.A constant-force mechanism is an important part of a mechanical watch movement that smooths out how it works and keeps it on time. Anyone who has played with a wind-up toy has seen how it starts moving quickly and slows down as the spring unwinds. The same is true in a watch. If the…