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 Technique Black brings a welcomed weight reduction with the ADLC coated titanium case while still highlighting the movement on the inside. Brand: Greubel Forsey Model: Double Tourbillon 30° Technique Black Reference Number: Double Tourbillon 30° Technique Black Movement: Manual Winding Case Material: Black ADLC Titanium Case Size: 47.5mm Dial: Black 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