Greubel Forsey

    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.
    

Greubel Forsey's first invention is an innovative double tourbillon mechanism (DT30), with one tourbillon - inclined at 30° and rotating in 60 seconds - inside another rotating every four minutes, to average out gravity-induced errors on the oscillator.

The DT30° Vision focuses on the visibility of the innovative invention, while the DT30° Secret has a closed dial merely hinting at the splendid treasure beneath.

The Double Tourbillon 30° system also lies at the heart of Invention Piece 1, although the displays, surfaces, architecture and aesthetics have all been profoundly developed in creating this exceptional timepiece.