GREUBEL FORSEY Double Tourbillon Technique Blue Limited Edition

This new edition of GREUBEL FORSEY Double Tourbillon Technique timepiece boasts a blue dial lay out. This new version is available in limited edition of 33 pieces in titanium, platinum or white gold.

Double Tourbillon Technique Blue

Equipped with a hand-wound movement with patented tourbillon, this timepiece incorporates an inner tourbillon inclined at a 30° angle and revolving 1 rotation per minute and an outer tourbillon that revolves 1 rotation in 4 minutes.

Double Tourbillon 30° Technique Blue

The combination of the 30° inclination with the different rotational speeds of the two tourbillion cages improves timekeeping by averaging out positional errors due to gravity in all usual wristwatch positions, and especially in static positions.

Double Tourbillon Technique Blue

In its dial side, the watch features a blue coloured multi-level synthetic sapphire hour ring with hour indexes and golden hour and minute hands with Super-LumiNova. In addition to the dazzling display of the two tourbillons, the dial also hosts a small seconds counter and a power reserve indicator.

Double Tourbillon 30° Technique Blue

Technical details

Model: Double Tourbillon Technique Blue
Limited edition of 33 pieces in titanium, platinum or white gold

Movement

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 dimensions
• Diameter: 38.40 mm
• Thickness: 12.15 mm

Number of parts
• Movement: 396 parts
• Two tourbillon cages: 132 parts
• Weight of the two cages: 1.17 g

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 open-worked 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
Diameter: 47.50 mm
Thickness: 16.84 mm
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
Water resistance of the case: 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

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