GREUBEL FORSEY – Quadruple Tourbillon Blue Red Gold & Platinum Limited Edition
Four new Opuses
This year at Basel 2018, Robert Greubel and Stephen Forsey are delighted to present four new variations of their leading creations.
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Quadruple Tourbillon Blue
The flagship Quadruple Tourbillon that showcases the second Fundamental Invention is today presented with a new three-dimensional blue-polished dial.
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Hand-finishing by Greubel Forsey
For this timepiece Greubel Forsey pushes the limits of Applied Art by presenting, for the first time ever, a black-polished dial.
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This hand-made finish of polished perfection has on this occasion been applied to an unusually large surface, covering the entire surface of the dial. An aweinspiring achievement. When reflecting direct light we see a blue of a depth seemingly never before attained.
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This technical challenge involved calling into question conventional methods to find solutions that could give rise to such an extraordinary result. An approach requiring great talent, infinite patience and prodigious dexterity.
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Technically, the four tourbillons offer a spectacle of astonishing elegance as they perform an ethereal, perfectly choreographed ballet. Each connected to a spherical differential, they contribute independently to obtaining a precise and reliable timing rate, especially in stable positions.
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The spherical differential transmits the average timing rate of the four tourbillons, thus improving the chronometric performance of all the regulating organs. In view of the impressive number of individual elements making up the movement, the case has been sculpted with asymmetrical forms.
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An asymmetry that forms an aesthetic reflection of the asynchronous dynamic of the four tourbillons.
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TECHNICAL SPECIFICATIONS
Collection: Quadruple Tourbillon
Limited edition of 8 pieces in platinum and 8 pieces in 5N red gold
Hand-wound movement with patented tourbillon
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Quadruple Tourbillon • hours and minutes • small seconds •
4-minutes outer-tourbillons rotation • power-reserve
Movement
Movement dimensions
• Diameter : 36.40 mm
• Thickness : 9.70 mm
Number of parts
• Movement : 534 parts
• 4 tourbillon cages : 261 parts
• Total weight of the cages : 2.26 g
• Spherical differential : 28 parts
Number of jewels • 63
• Olived-domed jewels in gold chatons
Chronometric power reserve • 50 hours
Barrels • Two series-coupled fast rotating barrels
(1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension
Balance wheel • Variable-inertia with white gold mean-time screws
(10.70 mm diameter)
Frequency • 21’600 vibrations/hour
Balance spring
• Phillips terminal curve
• Geneva-style stud
Main plates
• Nickel silver, spotted with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment
Bridges
• Nickel silver, frosted and spotted with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment
• Gold plate engraved with the individual number
• Two steel tourbillon bridges (movement side): flat black polished with hand-polished bevelling and countersinks
• Two synthetic sapphire tourbillon bridges (dial side)
Inner tourbillons
• Inclined at a 30° angle, 1 rotation per minute
Outer tourbillons
• 1 rotation in 4 minutes
• Hand-bevelled and openworked cage pillars
• 1 gold counterweight per double cage bearing the individual number of the timepiece
Gearing
• Involute circle profile
• Conical gearing with profiled teeth
Displays
- Hours and minutes
- Small seconds on a sector (mean performance)
- 50-hours power reserve on a sector
- 240-seconds outer-tourbillon rotation (on one of the outer cages)
Case
• In platinum 950 or in 18k 5N red gold with asymmetrical convex synthetic sapphire crystal
• Transparent back with asymmetrical convex synthetic sapphire crystal
• Lateral window with shaped synthetic sapphire crystal
• Three-dimensional, variable geometry-shaped lugs
• Raised polished engraving “Quadruple” and “Greubel Forsey” on a hand-punched background
• Gold security screws
• Polished bezel, caseband with hand-finished straight graining
• Hand-engraved individual number
Case dimensions
• Diameter : 43.50 mm
• Height : 16.11 mm
Water resistance of the case
• Water-resistant 3 atm - 30 m - 100 ft (standard NIHS 92-20/SN ISO 22810:2010)
Crown
• Platinum 950
• 18k 5N red gold with engraved and black-lacquered GF logo
Dial
• Multi-level in gold, blue finish (polished)
• Hand matt lapped gold indicators
Hands
• Hours and minutes in polished gold, with Super-LumiNova
• Small seconds, 240-seconds and power-reserve in polished gold
Strap and clasp
• Hand-sewn alligator
• Platinum 950 or 18k 5N red gold folding clasp, hand-engraved with the GF logo
Limited edition of 8 pieces.
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Press Release - 2018
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GREUBEL FORSEY SA
For further information:
Communication Department
press@greubelforsey.com – +41 79 194 2884
Eplatures-Grise -16 P.O. Box 670
2301 La Chaux-de-Fonds - Switzerland
+41 32 925-4545
+41 32 925-4502
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