The Greubal Forsey Quadruple tourbillon à Différentiel watch was presented at the 2012 SIHH, Salon International de la Haute Horlogerie, in Geneva.

While the full dial of the Greubal Forsey Quadruple tourbillon hides the two double tourbillon oscillators below, the two 4-minute indicators on the dial provide a hint of the complexity underneath. Turning the timepiece over enables the four tourbillons systems presented head to tail and coupled by a spherical differential to be appreciated at a glance through the display back.

Extraordinary choreography
Thanks to this uncompromising creation, Robert Greubel and Stephen Forsey have reaffirmed themselves as authentic inventors, using the mechanical timepiece as their means of expression. The Greubal Forsey Quadruple tourbillon à Différentiel is a blend of art and technical innovation which encapsulates the very soul of its the two creators. Transparent sapphire bridges were specifically chosen to allow unimpaired visual access to the perfectly choreographed aerial ballet of the four Tourbillons.

Asymmetrical balance
Robert Greubel and Stephen Forsey have engineered the four Tourbillons together in a contemporary design, in which elegance and harmony are the dominant features. In the same spirit, and owing to the impressive number of parts which make up the movement, an asymmetrically-shaped case was chosen. The asymmetrical form was also an aesthetic tribute to the asynchronicity of the four Tourbillons. To complement the homogeneous ensemble, the displays of the small second and the power reserve dials are semi-circular.

With its sophisticated coalescence of technical Invention and artistic design, the Greubal Forsey Quadruple tourbillon à Différentiel encapsulates the best in fine watchmaking. Wearing a Greubal Forsey Quadruple tourbillon à Différentiel is to enter the universe of Robert Greubel and Stephen Forsey, and to share, appreciate and be empathetic to the essential values emanating from their Invention.

The Greubal Forsey Quadruple tourbillon à Différentiel watch – The mechanism

An architectural apotheosis
With their new Greubal Forsey Quadruple tourbillon à Différentiel, Robert Greubel and Stephen Forsey have once again demonstrated their inventive and creative prowess and continue their ascent towards the summit of horological architecture. Greubel Forsey’s second fundamental Invention is the culmination of five years of research and development. Four separate Tourbillons are connec ted at the heart of two autonomous regulating organs. Each of the two regulating organs is composed of a balance wheel oscillator placed in a cage of a first Tourbillon rotating once a minute and inclined at 30 de – grees. This mechanism rotates within the cage of a second Tourbillon rotating every four minutes. The two oscillators, independently regulated inside the four Tourbillons, are coupled by a spherical differential which transmits their combined precision to the time display. Two barrels connected in series supply power through the spherical differential to the Tourbillons.

The height of virtuosity
At the heart of the Greubal Forsey Quadruple tourbillon à Différentiel, each of the four Tourbillons make their own distinct contribution towards achieving an exceptional level of accuracy. This is due to the asynchronicity of the Tourbillons’ locations relative to each other. This ensures that it is practically impossible for the balance wheels to be in an unfavourable position, no matter which angle the watch is in. By transmitting the averaged results of two oscillators, the spherical differential doubles the chronometric per formance of the two regulating organs, and also minimizes the smallest variations in the per formance of the oscillators. Ample energy is assured by two large, fast rotating barrels which guarantee a power reserve of 50 hours of. The energy stored in the two barrels is transmitted equally to the two regulating organs via the spherical differential.

The technological sophistication of this movement is such that it was necessary to invent new testing instruments, and only these were able to provide the necessary information for checking and verifying the per formance of the Greubal Forsey Quadruple tourbillon. Conceived to function in three dimensions, with this invention Robert Greubel and Stephen Forsey have created yet another another landmark Tourbillon wristwatch.

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