Greubel Forsey Double Balancier Convexe

With every invention, Greubel Forsey has added a significant milestone to the history of watch- making. The Double Balancier, patented in 2007, is one of them. It was first demonstrated in an EWT (Experimental Watch Technology) prototype, with two superimposed regulating organs inclined at 20°. A second iteration followed soon after, this time in a six piece unique edition with the two regulating organs positioned in different three-dimensional planes and inclined at 35°. Finally, in 2016, Greubel Forsey presented the invention in its current, double-patented form: the two balance wheels are dissociated, inclined at 30° and separated by a constant spherical differ- ential which calculates their average timing rate.