High-end Swiss horology atelier Greubel Forsey presents new blue dial version of its Quadruple Tourbillon watch. This timepiece is available in a platinum or an 18K red gold case.
Both models feature blue finished multi-level dial in gold. The hand-wound movement drives the patented quadruple tourbillon, hours and minute hands, small seconds, and power reserve indication.
Made of platinum 950 or 18k 5N red gold, the 43.5mm diameter case is fitted on a hand-sewn alligator strap secured with a precious metal folding clasp.
The mechanical manual-winding movement with 63 jewels and two series-coupled fast rotating barrels provides a power reserve of 50 hours. The inner tourbillons complete one rotation per minute and the outer tourbillions in 4 minutes.
The new Quadruple Tourbillon Blue watch by Greubel Forsey is available in a limited edition of 8 pieces in platinum and 8 pieces in 5N red gold.
Technical details
Movement specifications
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 or black chrome treatment
Bridges
• Nickel silver, frosted and spotted with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment
• Two engraved gold plates, one with the individual number and one with the text “Greubel Forsey”
• Four flat black polished and barrel-polished steel tourbillon bridges, hand-polished bevelling and countersinks
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 (mean performance)
• 50-hours power reserve on a sector
• 240-seconds outer-tourbillon rotation (on one of the outer cages)
Exterior
Case
In platinum 950 or in 18k 5N red gold 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
Hand-engraved individual number
Diameter: 43.50 mm
Height: 16.11 mm
Water resistance of the case: 3 atm – 30 m – 100 ft (standard NIHS 92-20/SN ISO 22810:2010)
Crown: In platinum 950 or in 18k 5N red gold with engraved and black-lacquered GF logo
Dial
Multi-level in gold, blue finish (polished)
Hand matt lapped gold indicators
Hands
Hours and minutes in polished gold, with Super-LumiNova
Small seconds, 240-seconds and power-reserve in polished gold
Strap and clasp
Hand-sewn alligator
Platinum 950 or 18k 5N red gold folding clasp, hand-engraved with the GF logo
Limited edition
8 pieces in platinum and 8 pieces in 5N red gold
