Excalibur Quatuor: this is the name chosen for the world’s first silicon watch incorporating four sprung balances. This exceptional achievement in the history of Fine Watchmaking is signed Roger Dubuis. This piece, played by four virtuosi and accompanied by five differentials, presents the ultimate challenge to gravity. The Excalibur Quatuor symbolises the mechanical magic of one of the most innov ative Manufactures of the 21st century. It pushes the limits in terms of precision and marks one of the major advances in contemporary watchmaking.