GREUBEL FORSEY – Double Tourbillon 30° Technique Blue Edition

GREUBEL FORSEY – Double Tourbillon 30° Technique Blue Limited Edition

Four new Opuses

This year at Basel, Robert Greubel and Stephen Forsey are delighted to present four new variations of their leading creations

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Double Tourbillon Technique Blue

The Double Tourbillon Technique Blue highlights the first Fundamental Invention.

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Integrated into the complex three-dimensional movement architecture, the sapphire crystal chapter-ring is transformed into a window through which to observe a miniature world of constant movement in which all the elements are intertwined, catching our eye from one gear-wheel to the next.

Hand-finishing by Greubel Forsey

For this timepiece, the challenge for Greubel Forsey was to preserve the homogeneity of the remarkable blue finish despite the apparent complexity of the movement architecture with the forms of the plates and bridges, and their shadows. The immersion is such that it almost resembles an abyss. In addition, the tourbillon bridges showcase a perfect Greubel Forsey black-polish.

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Robert Greubel and Stephen Forsey have created a magnificently transparent timepiece where each and every element is enhanced and displayed without overshadowing others.

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▲ White Gold
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The famous Double Tourbillon 30°, accompanied by four coaxial barrels, provides a chronometric power reserve of 120 hours. It contains an innovative spherical differential system for the power reserve display.

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This timepiece is a perfect illustration of movement architecture, with watchmaking craftsmanship and decorative arts working together in perfect harmony.

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▲ Titanium
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TECHNICAL SPECIFICATIONS

Collection: Quadruple Tourbillon

Double Tourbillon Technique Blue
Limited edition of 33 pieces in titanium, platinum or white gold
Hand-wound movement with patented tourbillon
Double Tourbillon 30° • hours and minutes • small seconds •
outer tourbillon 4-minutes rotation • inner tourbillon 60-seconds • power-reserve

Movement
Number of parts
• Movement : 396 parts
• Two tourbillon cages : 132 parts
• Weight of the two cages : 1.17 g
Movement dimensions
• Diameter : 38.40 mm
• Thickness : 12.15 mm
Number of jewels • 43
• Olived-domed jewels in gold chatons
Chronometric power reserve • 120 hours
Barrels
• Four coaxial series-coupled fast-rotating barrels
(1 turn in 3.2 hours), one of which is equipped with
a slipping spring to avoid excess tension
• Black finished 22k gold cover with relief engraving
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, frosted with polished bevelling and
countersinks, straight-grained flanks, blue finish
Bridges
• Nickel silver, frosted and spotted with polished
bevelling and countersinks, straight-grained flanks, blue finish
• Gold plate engraved with the individual number
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 counterweight
Gearing
• Involute circle profile
• Conical gearing with profiled teeth
Displays

• Hours and minutes
• Small seconds
• 120-hours power reserve on a sector
• 4-minutes outer tourbillon rotation
• 60-seconds inner tourbillon rotation

Exterior
Case
• In titanium with convex synthetic sapphire crystal
• Transparent back with synthetic sapphire crystal
• Three-dimensional, variable geometry-shaped lugs, screwed fixing
• Raised polished engraving “Double Tourbillon 30°” and “Greubel Forsey” on a hand-punched
background
• Gold security screws
• Polished bezel, caseband with hand-finished straight graining
• Two titanium plates, engraved, hand-finished with texts, screwed to the caseband
• Engraved individual number
Case dimensions 
Diameter : 47.50 mm
Thickness : 16.84 mm
Water resistance of the case
• Water-resistant 3 atm - 30 m - 100 ft
(standard NIHS 92-20/SN ISO 22810:2010)
Crown • In titanium with engraved GF logo
Dial side
• Multi-level synthetic sapphire hour-ring, galvanic growth hour indexes,
engraved and lacquered inner tourbillon rotation indicator
• Small seconds and power-reserve indicators in gold
Hands
• Hours and minutes in polished gold, with Super-LumiNova
• Small seconds, power-reserve (red triangles)
• Engraved synthetic sapphire 4-minutes indicator
Strap and clasp
• Black rubber or hand-sewn alligator
• Titanium folding clasp, engraved with the GF logo

Limited edition of 33 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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