The Greubel Forsey Quadruple Tourbillon à Différentiel is a blend of art and technical innovation that encapsulates the very soul of its two creators with its fascinating four tourbillons. This watch is fitted with an asymmetrical case in black ADLC titanium measuring 43.50mm in diameter and 16.11mm in thickness. This fascinating timepiece is fitted with a lateral window on the case band at 8 o'clock that allows for full view of one of the double tourbillon cages.