The Montblanc Tourbillon Bi-Cylindrique is a true technical marvel and features the same tourbillon construction as in ship’s chronometers. With this watch, Montblanc really shows what they can do.
Montblanc’s Tourbillon Bi-Cylindrique has a unique tourbillon construction, which has never before been implemented in a wrist watch. It’s iconic case with a teardrop shape at the 6 position was earlier used for the Grand Tourbillon Heures Mysterieuses and the Metamorphosis. Although the case, which is 47mm in diameter, is rather large it wears exceptionally comfortable.
The Tourbillon Bi-Cylindrique features the same tourbillon construction as can be found in a ship’s chronometer. Two cylindrical balance-springs are positioned concentrically, one inside the other. This requires the two balance-springs to have a different diameter, but they must have the same torque. While one balance-spring expands, the other contracts and vice versa. This way the torque remains the same and this optimizes the watches isochronism (or rate).
Three years ago Montblanc launched its first Tourbillon with a Heures Mysterieuses time indication manufactured in Villeret. The new Tourbillon Bi-Cylindrique features the same mysterious hour and minute display and now even reveals how the gears of the ‘Heures Mysterieuses’ work.