The Double Tourbillon 30°, the primary Fundamental Invention by Robert Greubel and Stephen Forsey as they continued looking for ultimate exactness, was introduced in a watch at Baselworld in 2004.
Seven years later, their Double Tourbillon 30° Technique won the principal prize at the Concours International de Chronométrie achieving a record score of 915 calls attention to of 1000 with an average planning rate of somewhere in the range of 0.3 and 0.8 seconds out of each day across the entire competition.
The latest interpretation of this selective creation comes in a restricted version of 11 watches housed in a blue ceramic case. It will be made available to the US market as it were.
The Greubel Forsey Double Tourbillon 30° Technique in ceramic offers exceptional accuracy thanks to a novel arrangement: inside a cage which rotates in a short time, a smaller cage containing the balance and spring assembly is slanted at an angle of 30° relative to the first cage and completes an unrest in quite a while. The combination of the 30° inclination with the distinctive rotational rates of the two tourbillons improves timekeeping by averaging out positional mistakes because of gravity on the whole usual wristwatch positions and especially in stable positions.
Four coaxial barrels coupled to a spherical force hold differential, give a chronometric power save of 120 hours. The development beats at a recurrence of 3 Hz (21,600 vibrations each hour).
Thanks to the utilization of sapphire crystal for the extensions, the hour and moment ring as well as the 4-minute tourbillon-rotation indicator at 6 o’clock, the development architecture can be appreciated completely and from the two sides.
The small seconds and force hold indicators in gold are done in blue to introduce a contrasting impact against the iced main plates and recall the blue ceramic of the case. The hands are openworked to additional enhance the feeling of light and transparency.
Machined from single squares of sapphire, the flanks of the extensions are cleaned utilizing various grains, requiring profoundly specialized devices, exceptional accuracy and ability. The sloped angles reveal a matt completion that beautifully contrasts with the cleaned transparent surfaces of the sapphire.
On the caseback side, the three-dimensional gear train connect reveals an unhampered perspective on the architecture beneath. This unusually large extension features a staggered plan with subsets that allow the wheels to correctly imbricate with the sapphire.
The case measures 48.40 mm in diameter and 17.77 mm in stature and is made in a dark blue ceramic, a first for Greubel Forsey. This material is compacted by squeezing and shaped prior to terminating, where a thermal cycle contracts it by around 25%. When the components have been sintered at an exceptionally high temperature, the ceramic sets, making the case incredibly hard, as well as amazingly resistant to scratches and consumption, yet in addition more hard to work with.
Provided with a blue elastic strap, gotten to the wrist by a titanium collapsing clasp, the Greubel Forsey Double Tourbillon 30° Technique in Ceramic has a cost of US$ 695,000. greubelforsey.com