GREUBEL FORSEY – Quadruple Tourbillon Black Edition

GREUBEL FORSEY – Quadruple Tourbillon Black ADLC Titanium Limited Edition

Quadruple Tourbillon Black

This timepiece that showcases the second Fundamental Invention is today presented with a case
made of titanium, a material that reduces the weight of the timepiece and thus ensures greater comfort.

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Entirely covered with a black ADLC treatment that makes it more resistant to scratches, this timepiece has a powerful visual impact from the very first glance.

Hand-finishing by Greubel Forsey

For this Timepiece, Greubel Forsey presents a rare view of the barrel-polished tourbillon cage, showing this minuscule piece as a paragon of meticulous work with no hint of even the slightest imperfection.

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Technically, the four tourbillons offer a spectacle of astonishing elegance as they perform an ethereal, perfectly choreographed ballet, connected to a spherical differential, they contribute independently to obtaining a precise and reliable timing rate, especially in stable positions. The spherical differential transmits the average timing rate of the four tourbillons, thus improving the chronometric performance of all the regulating organs.

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In view of the impressive number of individual elements making up the movement, the case has been sculpted with an asymmetric form. 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 black ADLC titanium
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)

Exterior
Case
• In black ADLC titanium 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
• 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
• In black ADLC titanium with engraved and GF logo
Dial
• Multi-level in gold, black colour
• Gold hour markers
• Gold display sectors
• Gold GF logo
Hands
• Hours and minutes in polished gold, with Super-LumiNova
• Small seconds, 240-seconds and power-reserve in polished gold
Strap and clasp
• Black rubber or hand-sewn alligator
• Black ADLC titanium folding clasp, 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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