Vacheron Constantin Traditionnelle Twin Beat Perpetual Calendar

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The SIHH 2019 is finally here and we can’t wait – like many other watch enthusiasts – to see what exciting new models the watch manufacturers will introduce. Vacheron Constantin is presenting the Traditionnelle Twin Beat Perpetual Calendar, a remarkable timepiece that can adapt to it’s wearer’s needs.

The perpetual calendar is a complex mechanism that can correctly display all date information despite variable months and leap years. Despite the pedigree of the classic case design in platinum and the prestige of a high complication, the Traditionnelle Twin Beat Perpetual Calendar deliberately embraces a modern aesthetic take on age-old finishing techniques.
On the dial, the 18th century art of engine turning and frosted finish are transmuted into clean radial guillochage and sand-blasted surfaces. In order to achieve this union of tradition and modernity, the dial is made in two main segments.

The Vacheron Constantin Traditionnelle Twin Beat Perpetual Calendar is displaying the hours, minutes, date, month, leap year cycle and power reserve on its dial. The watch features a 42-mm-platinum case which is water-resistant up to 3 bar.

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One of the most basic assumptions of mechanical watchmaking used to be that the energy output of the mainspring barrel had a fixed timespan, with very little deviation from the stated power reserve. The Traditionnelle Twin Beat Perpetual Calendar transforms the mainspring into a source of variable energy levels, giving mechanical watchmaking a completely new degree of versatility.

A pusher at the 8 o’clock position allows the wearer to easily switch from one frequency to another. When in Active mode, the movement features a 5 Hz balance and a 4 days of power reserve; if the watch is taken off, it can be switched to Standby mode, drastically reducing the frequency to 1.2 Hz and thus extending the power reserve to 65 days. At any point during the Standby mode, the Traditionnelle Twin Beat Perpetual Calendar can be switched back to Active mode and reworn, with all its calendar indications perfectly up to date.
The calibre managing all this is an in-house movement; the 3610 QP. Because the calibre has two balance wheels, only one of which is allowed to oscillate at one time, the hour and minute hands have to draw variable information from two gear trains for one reading of the time. This is accomplished by a gear differential that allows the hands to read more than one input source of timekeeping data.

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Vacheron Constantin is fitting the Traditionnelle Twin Beat Perpetual Calendar with a grey alligator leather strap, matching the color of the dial.
The watch will be exclusively available from Vacheron Constantin boutiques.

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