Without a doubt, the new Greubel Forsey Double Tourbillon 30° Technique Sapphire is the craziest and most unique piece ever released by the brand. Available in a limited edition of 8 pieces, this amazing timepiece features a round sapphire case measuring 49.95 mm in diameter and 17.15 in thickness, an absolute first for the brand when it comes to case materials. Equipped with a manual wound movement with patented double tourbillon set at an inclination of 30 degrees, the outer tourbillon does a rotation every four minutes, while the inner tourbillon does a full rotation every minute.