Montblanc Tourbillon Bi-Cylindrique

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.

For the latest reports live from the Salon International de la Haute Horlogerie 2011, check out the Montblanc Facebook page and Montblanc Stories.

Frank Geelen

Frank Geelen is an expert on Haute Horlogerie and his horological heart beats faster from beautiful hand-finished mechanical movements. He loves to explain all technical details of complications like tourbillons, minute repeaters, constant force escapements and column-wheel chronographs and he has been doing that for more than seven years. Besides publishing daily here at Monochrome Watches, Frank also writes for several other publications, both online and offline.

View all articles by Frank Geelen

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