Greubel Forsey Caliber GF02N

The Greubel Forsey caliber GF02N is a manual-wind double tourbillon movement found in the award-winning Greubel Forsey Invention 1 watch.

Double Tourbillon 30°:

The GN02N features the brand’s inventive Double Tourbillon 30° complication. It is called “30 degrees” because of the 30-degree angle separating the two tourbillon cages.

Together, the double cage is constructed of 128 parts that weigh in at a mere 1.17 grams.

One the outside is a 4 minute tourbillon with a 60 seconds tourbillon within. The goal of this double setup is to improve accuracy while more efficiently handling constant movement by the watch wearer.

In the brand’s own words:

“Invention Piece 1 Double Tourbillon 30° It took us four years of research and development to realise our first invention, the Double Tourbillon 30°, which features an innovative double tourbillon mechanism with one tourbillon – inclined at 30° and rotating in 60 seconds – inside another rotating in four minutes. The combination of the 30° inclination with the different rotational speeds of the two tourbillons improves timekeeping by averaging out positional errors due to gravity, especially in stable positions.” -Grebuel Forsey

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