At the Salon International de la Haute Horlogerie, the 2019 edition, Vacheron Constantin presents the Traditionnelle Twin Beat Perpetual Calendar, a timepiece that can adapt to its wearer’s needs.

When worn, the Traditionnelle Twin Beat Perpetual Calendar beats at a high frequency that is aligned with modern active lifestyles, displaying the hours, minutes, date, month, leap year cycle and power reserve on its dial.
When the watch is not being worn, its in-house developed calibre 3610 QP can be slowed down in order to guarantee an extended power reserve of at least 65 days.

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 fine mechanical watchmaking a completely new degree of versatility.
Drawing on 264 years of horological expertise, Vacheron Constantin has achieved this innovative coup by giving the Traditionnelle Twin Beat Perpetual Calendar two balances, each operating at a different frequency that has never been used before by the Maison. A pusher at the 8 o’clock position allows the wearer to easily switch from one frequency to another, depending on activity level. When the watch is on the wrist, the wearer will get the most out of it by keeping it in Active mode, which features a 5Hz (36,000vph) balance and 4 days of power reserve.
If the watch is to be taken off and left unworn for some time, it can be switched to Standby mode, which runs on a second balance with a drastically reduced frequency of 1.2Hz (8,640vph). This allows the maximum power reserve to be extended to at least 65 days. At any point during the Standby mode running time, the Traditionnelle Twin Beat Perpetual Calendar can be switched back to Active mode and reworn, with all its calendar indications perfectly up to date.

A hand-wound perpetual calendar can be set flat on a table and picked up more than two months later, still displaying the correct date and month. The Vacheron Constantin Traditionnelle Twin Beat Perpetual Calendar brings true significance to the “perpetual” part of its name and charts a new course of timeless innovation.

The Vacheron Constantin Traditionnelle Twin Beat Perpetual Calendar utilises a patent-pending mechanical system that enables instantaneous switching between Active mode (5Hz, 36,000vph) and Standby mode (1.2Hz, 8,640vph) without interrupting the ability of the movement to keep time.

Both the Active (5Hz, 36,000vph) and Standby (1.2Hz, 8,640vph) balances are driven by the same mainspring barrel, which is the most efficient way of distributing energy and the only way to have a single power-reserve indication.

In the Traditionnelle Twin Beat Perpetual Calendar, Vacheron Constantin has implemented instantaneous jumping indications for the date, month and leap year. Simultaneously, the jumping mechanism (patentpending) has been completely redesigned, utilising a sprung dual-gear compound system that requires four times less torque than a conventional jumping display. With this improvement, even at midnight on New Year’s Eve when all three indications jump instantaneously, the effect on the amplitude of the active balance is negligible.

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 very 18th-century art of engine turning and frosted finish are transmuted into clean radial guillochage and sand-blasted surfaces. In order to perfectly achieve this union of tradition and modernity, the dial is made in two main segments in a multi-stage process. A gold dial segment is decorated with handguillochage, and then fitted within an outer segment of sapphire crystal. Gold hour indexes are then set into the sapphire-crystal dial segment, which is further laser-engraved and ink-filled for a sleek, seamless appearance.

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