Greubel Forsey today launches a re-imagined Double Tourbillon 30 degrees Technique (which originally debuted in 2004) as a special U.S. edition transformed with clear sapphire components and encased in highly detailed blue ceramic. And while Greubel Forsey has previously displayed its expertise creating clear sapphire cases for several of its most complicated timepieces, this new release marks the watchmaker’s first-ever ceramic case.
Now framed in lustrous deep-blue, the resulting remade Double Tourbillon 30 degrees Technique mechanism takes on a new and somewhat startling clarity, especially as it reveals Greubel Forsey’s spectacular dual suspended tourbillon cages. One cage rotates in four minutes while inside of it a smaller cage inclined at an angle of 30 degrees (relative to the first cage) completes a revolution in sixty seconds.
You may recall that the Double Tourbillon 30 degrees Technique was the first Fundamental Invention by Greubel Forsey and, when presented competitively, garnered a first prize at the Concours International de Chronométrie in 2011.
To create its new blue ceramic case (which measures 48.40mm in diameter and 17.77 mm in height) Greubel Forsey sintered the ceramic at a very high temperature, and then had to apply its legendary finishing techniques to the new material. The finishers first polished the ceramic and then laboriously began to circular satin-finish it while following the case’s new curves and contours. The resulting case retains its deep blue hue while appearing to shimmer in the light, though with a more contemporary caste than that delivered by the watch’s previous precious metal cases.
That light also plays an important role in re-defining the new appearance of both sides of the Double Tourbillon 30 degrees.
On the dial side, Greubel Forsey has re-created the tourbillon bridge, barrel bridge, differential bridge and power-reserve bridge by manufacturing all these components in clear sapphire. And as Greubel Forsey explains, “even the restrictions imposed by screws were taken into consideration in this spirit of creation: The bridges are specially mounted to absorb shocks to which the sapphire could be subjected. The plates, bridges and the mechanical architecture are therefore entirely new.”
From the dial you’ll see that the small seconds and power-reserve indicators, while made from gold, are actually finished in blue so they enhance their contrast to the frosted main plates and blue ceramic case. The hour and minute ring, as well as the four-minute tourbillon-rotation indicator, are also both made from sapphire. The hands are open worked.
Turning the watch over, the three-dimensional gear train bridge gives observers a clear view of the architecture beneath it. The lower tourbillon bridge – also made from sapphire – beautifully reproduces the steel bridge of the first Double Tourbillon 30° Technique.
Greubel Forsey is releasing this new blue ceramic Double Tourbillon 30 degree Technique with its all-new sapphire components as a unique edition of eleven timepieces to the U.S. market. The watch is supplied with a blue rubber strap, complete with a titanium folding clasp decorated with a hand- engraved Greubel Forsey logo. The crown – also in ceramic – features a tone-on-tone engraved Greubel Forsey logo. Price: $695,000.
Specifications: Greubel Forsey Double Tourbillon 30° Technique blue ceramic
Movement: 421 parts, two tourbillon cages, 120 hours of power reserve, 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, 22-karat gold cover with nickel-palladium treatment and relief engraving. Main Plates are nickel silver, frosted with polished beveling and countersinks, straight-grained flanks, nickel-palladium treatment. Bridges are synthetic sapphire crystal, polished flanks, nickel silver, frosted and spotted with polished beveling and countersinks, straight-grained flanks, nickel-palladium treatment.
The inner tourbillon is inclined at a 30° angle, 1 rotation per minute while the outer tourbillon performs one rotation in four minutes; Hand-beveled and open-worked cage pillars with gold counterweight
Displays: Hours and minutes, small seconds, 120-hours power reserve on a sector, 4-minutes outer tourbillon rotation, 60-seconds inner tourbillon rotation
Case: 48.4mm by 17.77mm ceramic, caseback, bezel and case band machined from a block of ceramic, polished and straight grained, hand-finished. Three-dimensional, variable geometry-shaped lugs, engraved “Double Tourbillon 30°” and “Greubel Forsey," engraved individual number, ceramic crown with engraved GF logo
Dial: 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, blue finish. Hands: Hours and minutes in polished gold, with Super-LumiNova, small seconds, power-reserve (red triangles), engraved synthetic sapphire 4-minutes indicator
Strap: Rubber with titanium folding clasp engraved with the GF logo