Between art and technological innovation, the 2nd Fundamental Invention by Robert Greubel and Stephen Forsey propels its designers even closer to the heights of horological architecture. The four tourbillons of this stunning composition contribute independently to its exceptional time-keeping performance. This is made possible by the asynchronous position of each of the four tourbillons, which are connected to two autonomous regulating organs. These organs, each housed in a tourbillon cage, are coupled to the spherical differential which ensures transmission to the display system. A pinnacle of virtuosity poised to write a new page in the art of horology.

Patented hand-wound, comprising 531 components, four independent tourbillons housed in two double cages, 63 rubies, 21,600 vib/h, rapid-rotation double barrel in series, 50-hour power reserve
Two interior tourbillons at a 30° angle rotate every 60 seconds, two exterior tourbillons rotate every 4 minutes, hours and minutes, sectorial display of small seconds and power reserve
5N (18K) red gold, 43.5 mm
Asymmetrical convex sapphire crystal and transparent back
Lateral window with shaped sapphire crystal
Back with hand-hammered bas-relief engraving of the name of the invention
Water-resistant to 30 m
Solid 18K gold, black
Black, hand-sewn alligator with gold folding clasp, hand-engraved “Greubel Forsey”

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