Greubel Forsey Double Tourbillon 30° Technique

The Greubel Forsey Double Tourbillon Technique watch houses an extremely complex mechanical hand-wound movement (Calibre GF 02S) with two tourbillon mechanisms.

Equipped with the Double Tourbillon 30°, the first invention by Greubel Forsey, this timepiece is available in 5N red gold, white gold and platinum versions. Main features of this complication watch are centrally positioned hours and minutes hands, outer tourbillon, inner tourbillon and power-reserve indicator.

GREUBEL FORSEY Double Tourbillon 30° Technique

The inner tourbillon, inclined at a 30° angle, performs 1 rotation in four minutes. The outer tourbillon completes one resolution in 60 seconds. The movement is capable of delivering 120 hours power reserve that can be monitored with the Reserve De Marche indicator at 3 o’clock.

Since its founding in 2004, Greubel Forsey has produced three Double Tourbillon 30° lines: Contemporaine (Vision and Secret), Invention (Invention Piece 1) and Technique (Double Tourbillon 30° Technique).

Technical details

Model: GREUBEL FORSEY Double Tourbillon 30° Technique

Movement
Mechanical hand-wound movement, Calibre GF 02s
Diameter: 38.40 mm
Thickness: 12.15 mm
Barrels: Four coaxial series-coupled fast-rotating barrels (1 turn in 3.2 hours), equipped with a slipping spring to avoid excess tension; Gold nickel-palladium finished cover with relief engraving
Balance wheel: Variable-inertia with white gold mean-time screws (10.70 mm diameter)
Frequency: 21,600 vibrations/hour
Power reserve: 120 hours
Balance spring: Phillips terminal curve; Geneva-style stud
Main Plates: Frosted nickel silver, polished bevelling, black chromed finish
Bridges: Frosted nickel silver, polished bevelling, nickel-palladium finish, gold nameplate bearing the watch number
Gearing: Involute circle profile; Conical gearing with corrected profile

Number of parts
– Complete movement: 385 parts
– 2 Tourbillon cages: 128 parts
– Weight of the two cages : 1.17 g
– Number of jewels: 43; Olive-domed jewels in gold chatons

Tourbillons
Inner Tourbillon: Inclined at a 30° angle, 1 rotation per minute
Outer Tourbillon: 1 rotation in 4 minutes; Hand-bevelled and openworked cage pillars; Solid gold counterweight

Displays
Hours and minutes
Small seconds
4-minute Outer Tourbillon rotation indicator
120-hour power reserve on a sector

Case
Diameter : 47.50 mm
Thickness : 16.84 mm
In 5N red gold, white gold or platinum with convex sapphire crystal
Transparent back with convex sapphire crystal
Raised polished engraving of the name of the Invention on a hand-punched background
Gold security screws
Nameplates with text screwed to the sides
Three-dimensional lugs secured with screws
Hand-engraved individual number
Water resistance of the case: 3 ATM – 30 M – 100 FT
Crown: Gold with engraved and black lacquered GF logo

Dial
Sapphire hour markers
Small seconds and power-reserve indicators in gold

Hands
Hours and minutes in gold
Small seconds, Power reserve (red triangles)
Sapphire 4-minute indicator

Strap
Hand-sewn black, brown, dark blue, grey or burgundy alligator leather with gold folding clasp, engraved with the Greubel Forsey logo

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