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I already posted about the GF Double Tourbi HERE

But now I find the QUADRUPLE TOURBILLON from Greubel Forsey. This one is just nuts.


The spherical differential linking the four tourbillon carriages of the Quadruple Tourbillon is a prime example of Greubel Forsey's inventive approach, as it exhibits an unprecedented degree of complexity, refinement and timekeeping performance.
Four asynchronous tourbillons independently contribute to its high precision. The spherical differential acts like a car's differential in distributing torque between two wheels while allowing them to rotate at different speeds.
The asymmetrical format of the two double tourbillons provides clear visibility to all carriages on the dial side, enables an additional lateral view through the side-window and eliminates the necessity for a larger movement diameter - all in a highly distinctive elegant case.


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Baselworld '09: Greubel Forsey 2nd Fundamental Invention Quadruple tourbillon à différentiel sphérique
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 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 Quadruple Tourbillon à Différentiel encapsulates the best in fine watchmaking.

Wearing a 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.

An architectural apotheosis

With their new 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 connected 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 degrees. 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 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 performance of the two regulating organs, and also minimizes the smallest variations in the performance 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 performance of the Quadruple Tourbillon.

Conceived to function in three dimensions, with this invention Robert Greubel and Stephen Forsey have created yet another another landmark Tourbillon wristwatch.

Quadruple Tourbillon à Différentiel Sphérique
Platinum case with lateral window, silvered gold dial
Mechanical hand-wound movement, Calibre GF03
Quadruple Tourbillon, seconds indicator and power-reserve indicator

Patented Movement

Movement dimensions
• Diameter: 36.4 mm
• Thickness: 9.70 mm
Number of parts
• Complete movement: 531 parts
• 2 double Tourbillon cages: 128 parts each
• Weight of each double cage: 1.17 g
• Spherical differential: 28 parts
Number of jewels 63
Olived-domed jewels in gold chatons
Power reserve 50 hours
Barrels Rapid rotating twin barrels (1 Turn in 3.2 hours) one of which is equipped with a slipping spring to avoid excess tension
Balance wheel Free sprung balance with white gold mean-time screws (10.7 mm diameter)
Frequency 21’600 vibrations/hour
Balance spring
• Phillips terminal curve
• Geneva-style stud
Main Plates Nickel silver, spotted nickel palladium-finish, hand bevelled, straight-grained flanks, polished counter-sinks
• Barrel bridge:nickel silver, hand bevelled and frosted, nickel palladium-finish, “Greubel Forsey” gold plate with the individual number of the timepiece
• Two steel Tourbillon bridges (movement side): hand-bevelled, flat black polished with polished counter-sinks
• Two sapphire Tourbillon bridges (dial side)
• Involute circle profile
• Conical gearing with corrected profile
Inner Tourbillon Inclined at a 30°angle, 1 rotation per minute
Outer Tourbillon
• 1 rotation in 4 minutes
• Hand-bevelled and openworked cage pillars
• Gold Greubel Forsey counterweights
• Hours and minutes
• Small second sector (mean performance)
• Power reserve on a sector
• Tourbillon rotation indicator (outer cage)in 240 seconds


• 5N red gold or platinum with asymmetrical convex sapphire crystal
• Transparent back with asymmetrical convex sapphire crystal
• Lateral window with shaped sapphire crystal
• 3 dimensional, variable geometry-shaped lugs
• Gold security screws
Case finishing
• Polished bezel and centre band with hand-finished straight graining
• Hand-engraved individual number
• Raised engraving of the name of the Invention on a hand-punched backgroundor leather with gold folding clasp, hand-embossed with the Greubel Forsey initials
Case dimensions
• Diameter: 43.5 mm
• Thickness: 16.06 mm
Water resistance of the case 3 atm – 30 m – 100 ft
Crown Platinum with engraved and black lacquered GF logo
• Gold dial
• Gold appliques
• Gold display sectors
• Applied gold logo
Hands Hours and minutes, small seconds and power-reserve in gold
Strap Hand-sewn black alligator leather with gold folding clasp, hand-embossed with the Greubel Forsey initials

Source -

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What can you say! WOW!:BE

This looks like a complete labor of love! I would just stare at this piece forever! :lol

Nothing about that timepiece is about telling the time . . . it's about engineering, design, art, and pure talent! However, that has got to be incredibly accurate! :c

I wonder if I could get this on VPs?
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