The Double Tourbillon 30° Technique is an open worked version of the first watch Greubel Forsey ever launched; the Double Tourbillion 30°. Hour indices on a sapphire disc appear to float inside the case and every aspect of the movement seems to jump out at you. The Bi-Color version is the same as the original but with black ADLC coated titanium side panels that recount the story of the inventors of Greubel Forsey. Available in 18 karat red gold or platinum. Brand: Greubel Forsey Model: Double Tourbillon 30° Technique Bi-Color Reference Number: Double Tourbillon 30° Technique Bi-Color Movement: Manual Winding Case Material: Red Gold or Platinum Case Size: 47.5mm Dial: Black or Silver Bracelet/Strap: Leather Gender: Men's Watch/Unisex Warranty: Manufacturer's Warranty Features: Tourbillon Small Seconds Power Reserve Shop other beautiful pieces in our Greubel Forsey collection For inquiries on the piece please contact: boutique@shsilver.com