Two unique series GREUBEL FORSEY - The Double Tourbillon 30° Edition Historique
Since the launch of The Double Tourbillon 30° in 2004, Greubel Forsey has released 3 lines based on this invention, namely: Contemporaine (which includes Vision and Secret models), Invention (which includes the Invention Piece 1 model) and Technique (the Double Tourbillon 30° Technique model).