In search of extremely high precision, Robert Greubel and Stephen Forsey began to create a work in 1999 that reinterpreted the tourbillon and improved the timing function. The double tourbillon 30 ° is Grauber Fossi’s first basic invention and was exhibited at the Basel fake watches for sale Fair in 2004. This proves the success of the independent studio. Seven years later, the double tourbillon 30 ° technology won first place in Concours. International Times. Throughout the competition, the timer scored a record 915 points (out of 1,000 points), with an average timing speed of 0.3 to 0.8 seconds per day.
Now, Greubel Forsey has launched the blue ceramic double tourbillon 30 ° technology, which is an extremely accurate, delicate and strong timepiece.
Unparalleled precision timepiece center
The 30 ° double tourbillon contributes to its extraordinary accuracy. Inside the cage that rotates for four minutes, a smaller cage equipped with a balance wheel and spring assembly is tilted at an angle of 30 ° relative to the first cage, and completes the rotation within 60 seconds. Combining the 30 ° inclination with the different speeds of the two tourbillons can average out the position errors due to gravity in all conventional watch positions (especially stable positions), thereby improving timing performance.
In the Double Tourbillon 30 ° double tourbillon technology, four coaxial barrels are connected to a spherical power reserve differential, which provides a 120-hour chronograph power reserve.
Ceramic case: robustness and luminosity
This is the first time Greubel Forsey copy has demonstrated the movement inside a ceramic case. The manufacture of this case requires extremely high precision. The material is compacted by pressing and then shaped before firing. During the heat treatment, the material shrinks it by about 25%. Once the element is sintered at a very high temperature, the ceramic will solidify, making the watch case very hard and therefore more difficult to use. The material becomes very resistant to scratches and corrosion, which means that surface treatment requires excellent expertise. From polishing to linear or circular satin polishing, the surface treatment can perfect the outline of the timepiece, perfected with the true Greubel Forsey spirit. The dark blue ceramic brings a subtle flash to the Double Tourbillon 30 ° technology, while its physical properties make it extremely resistant.
The bottom cover of the blue ceramic case, the bezel and the strap are made of a piece of ceramic, which is polished and straight-lined and finished by hand. Three-dimensional variable geometry lugs. The size is 48.4mm x 17.7mm. It has a double-layer sapphire crystal, waterproof to 30 meters.
The movement is a Swiss manually wound Greubel Forsey movement Double Tourbillon 30 °, equipped with 43 jewels, 21,600 vph and a 120-hour power reserve. Synthetic sapphire bridge. Olive domed gemstone, located in a golden pendant. Four coaxial series rotating barrels quickly (one in 3.2 hours), one of which is equipped with a sliding spring to avoid excessive tension. 22kt gold cover with nickel palladium treatment and relief. Variable inertial balance wheel with platinum hour-marking screws. Hairspring: Phillips terminal curve, Geneva style studs.
Motherboard: nickel silver, matte polished bevel and counter hole, straight flank, nickel palladium treatment. Bridge: artificial sapphire crystal, polished wings. Nickel silver, matte and speckled, with polished bevels and counter holes, straight flank, nickel palladium treatment. The gold plate is engraved with a personal number. Gear: involute circular outline. Bevel gear with profiled teeth. Functions are: hours and minutes, small seconds. The outer tourbillon spins for 4 minutes. Built-in tourbillon for 60 seconds. Power reserve indicator.
“Dial” is a natural sapphire hour scale, electric growth hour scale, engraved and painted tourbillon rotation indicator. Small second hand and power reserve indicator, gold, blue surface; hands: polished gold for hours and minutes, equipped with SuperLuminova swiss watches online, second hand, power reserve (red triangle), sapphire engraved 4-minute hand, blue rubber strap, titanium Metal folding clasp.