The Greubel Forsey Quadruple Tourbillon contains four tourbillons that perform perfectly together like a well choreographed ballet. Each tourbillon contains a smaller tourbillon and can be seen from the front of the dial. Connected to a spherical differential, they contribute independently to the precise timing of the watch. The black ADLC titanium case brings a reduced weight to the piece. Limited to 8 pieces. Brand: Greubel Forsey Model: Quadruple Tourbillon Black Reference Number: Quadruple Tourbillon Black Movement: Manual Winding Case Material: Black ADLC Titanium Case Size: 43.5mm Dial: Black Gold Bracelet/Strap: Rubber Gender: Men's Watch/Unisex Warranty: Manufacturer's Warranty Features: Tourbillon Power Reserve Shop other beautiful pieces in our Greubel Forsey collection For inquiries on the piece please contact: boutique@shsilver.com