Greubel Forsey Quadruple Tourbillon

The Quadruple Tourbillon is Greubel Forsey’s second fundamental invention. Each of the four tourbillon cages are grouped in pairs and connected to a spherical differential. The spherical differential transmits the average timing rate of each of the four tourbillons and improves the chronometric performance of the regulating organs. The result is optimal timekeeping precision, particularly with the timepiece at rest in a stable position. For more visit