GREUBEL FORSEY Double Tourbillon Technique

Swiss luxury watch maker GREUBEL FORSEY introduces Double Tourbillon Technique which houses a Mechanical hand-wound movement, Calibre GF 02S.  Available in 5N red gold, white gold and platinum versions, main features of this complication watch include Double Tourbillon 30°, Hours and minutes display, Outer Tourbillon 4-minute rotation indicator, Inner Tourbillon 60 Second rotation indicator and power-reserve indicator.

Technical details
Movement
Mechanical hand-wound movement, Calibre GF 02s
Diameter : 38.40 mm/ Thickness : 12.15 mm

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

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

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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