Greubel Forsey's finished inventions are the result of years of stringent development and exhaustive testing. One common denominator of all Greubel Forsey's inventions, besides their sublime beauty, is that they all reliably improve timekeeping precision.
The 'Double Tourbillon 30°', Greubel Forsey's first invention, features two tourbillons, one rotating inside the other.
In the second invention, four asynchronous tourbillons independently contribute to the extremely high accuracy of the 'Quadruple Tourbillon
The third fundamental invention, the 'Tourbillon 24 Secondes Incliné, masters positional errors using a single ultra-light inclined tourbillon cage rotating with high angular velocity.