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Transparent sapphire bridges were specifically chosen to allow unimpaired visual access to the perfectly choreographed aerial ballet of the four Tourbillons.<br \/><br \/><strong>Asymmetrical balance<br \/><br \/><\/strong>Robert Greubel and Stephen Forsey have engineered the four Tourbillons together in a contemporar y 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 \u00e0 Diff\u00e9rentiel encapsulates the best in fine watchmaking. Wearing a Quadruple Tourbillon \u00e0 Diff\u00e9rentiel 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.<br \/><br \/><strong>The mechanism<\/strong><br \/><br \/><strong>An architectural apotheosis<\/strong><br \/><br \/>With their new Quadruple Tourbillon \u00e0 Diff\u00e9rentiel, 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\u2019s second fundamental Invention is the culmination of five years of research and development. Four separate Tourbillons are connected at the hear t 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 ever y 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.<br \/><br \/><strong>The height of virtuosity<\/strong><br \/><br \/>At the heart of the Quadruple Tourbillon \u00e0 Diff\u00e9rentiel, 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\u2019 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. 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{"Compl\u00e9ment":"Red gold case","Statut de vente":"En vente depuis","Date":"2011","Pi\u00e8ce unique":"No","S\u00e9rie limit\u00e9e":"No","Sexe":"Homme","Gaucher":"No","Diam\u00e8tre":"43.5","Epaisseur":"16.11","Types":"Hand-winding","Styles":"Atypical, High Horology","Calibre_autre":"GF 03","Affichage_autre":"Openworked hands","Complication":"Small Seconds, Power Reserve Indicator","Mati\u00e8re du bo\u00eetier":"Red gold","Particularit\u00e9 du boitier":"Sapphire caseback","Etanch\u00e9it\u00e9":"30 meters","Forme":"Other","Couleur du cadran":"Black","Index":"Roman numerals, Baton-type","Verre":"Sapphire, Domed","Verre_autre":"Asymmetrical","Mati\u00e8re du bracelet":"Alligator leather","Fermeture du bracelet":"Folding buckle ","Couleur du bracelet":"Black","Plus de caract\u00e9ristiques":"Quadruple Tourbillon<br \/><br \/>Movement<br \/>531 parts<div>2 double Tourbillon cages:<br \/>128 parts<\/div><div>Weight of each double cage: 1.17 g<br \/>Spherical differential: <br \/>28 parts<br \/>63 jewels<br \/>Olive-domed jewels in gold chatons<\/div><div>Power reserve : 50 hours<\/div><div>Rapid rotating twin barrels equipped with a slipping spring to avoid excessive tension<\/div><div>Variable-inertia balance wheel with gold mean-time screws<\/div><div>Frequency :<\/div><div>21 600 vibrations \/ hour<\/div><div>Balance spring : Phillips terminal curve and Geneva-style stud<\/div><div>Main plates Nickel silver. spotted nickel palladium-finish. hand bevelled. straight-grained flanks. polished counter-sinks<\/div>Barrel bridge:nickel silver. hand bevelled and frosted. nickel palladium-finish. \u201cGreubel Forsey\u201d gold plate with the individual number of the timepiece<br \/><div>Two steel Tourbillon bridges hand-bevelled. flat black polished with polished counter-sinks<br \/>Two sapphire Tourbillon bridges<br \/>Involute circle profile<br \/>Conical gearing with corrected profile<br \/>Inner Tourbillon<br \/>Outer Tourbillon<br \/><br \/>Case<br \/><\/div><div>Lateral window with shaped sapphire crystal<br \/>3 dimensional. variable geometry-shaped lugs<br \/><\/div><div>Gold security screws<br \/>Polished bezel and centre band with hand-finished straight graining<br \/><\/div><div>Hand-engraved individual number<br \/>Raised engraving of the name of the Invention on a hand-punched background <br \/><\/div><div>Crown platinum with engraved and black lacquered GF logo<\/div><br \/><div>Hand-sewn strap<\/div><div>Folding clasp engraved with the Greubel Forsey logo<\/div>"}

Quadruple Tourbillon

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Brand  :	Greubel Forsey
Collection  :	Quadruple Tourbillon
Model  :	Quadruple Tourbillon
Reference  :
Complement :	Red gold case
On sale :	2011

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Another exceptional watch with a red gold case, signed by both artists watchmakers Robert Greubel and Stephen Forsey. Two double tourbillon cages give it its accuracy at the top.

• Brand  :	Greubel Forsey
  Collection  :	Quadruple Tourbillon
  Model  :	Quadruple Tourbillon
  Reference  :
  Complement :	Red gold case
  On sale :	2011
  List Price :	On request
  Diameter :	43.5 mm
  Thickness :	16.11 mm
  Styles :	Atypical High Horology
  Types :	Hand-winding
  Calibre :	GF 03
  Complication :	Small Seconds Power Reserve Indicator
  Case material :	Red gold
  Case peculiarity :	Sapphire caseback
  Shape :	Other
  Water-resistance :	30 meters
  Dial color :	Black
  Display :	Openworked hands
  Indexes :	Roman numerals Baton-type
  Glass :	Sapphire Domed Asymmetrical
  Strap material :	Alligator leather
  Strap color :	Black
  Strap clasp :	Folding buckle
  + More characteristics :	Quadruple Tourbillon Movement 531 parts 2 double Tourbillon cages: 128 parts Weight of each double cage: 1.17 g Spherical differential: 28 parts 63 jewels Olive-domed jewels in gold chatons Power reserve : 50 hours Rapid rotating twin barrels equipped with a slipping spring to avoid excessive tension Variable-inertia balance wheel with gold mean-time screws Frequency : 21 600 vibrations / hour Balance spring : Phillips terminal curve and 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 hand-bevelled. flat black polished with polished counter-sinks Two sapphire Tourbillon bridges Involute circle profile Conical gearing with corrected profile Inner Tourbillon Outer Tourbillon Case Lateral window with shaped sapphire crystal 3 dimensional. variable geometry-shaped lugs Gold security screws 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 background Crown platinum with engraved and black lacquered GF logo Hand-sewn strap Folding clasp engraved with the Greubel Forsey logo

DESCRIPTION

• Quadruple tourbillon
  
  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 contemporar y 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.
  
  The mechanism
  
  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 hear t 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 ever y 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, fastrotating 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 necessar y 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.