Greubel Forsey's Quadruple Tourbillon is made of exactly what it says - quadruple tourbillons. Unlike the traditional Quadruple Tourbillon where the movement is visible from the front of the watch, the Secret hides the mechanisms behind the black gold dial and can only be visible through the sapphire caseback, though the dial does display an indication for how the tourbillons are moving. With a case made of 18 karat red gold, this watch is limited to 8 pieces. Brand: Greubel Forsey Model: Quadruple Tourbillon Secret Red Gold Reference Number: Quadruple Tourbillon Secret Red Gold Movement: Manual Winding Case Material: Red Gold Case Size: 43.5mm Dial: Black Gold Bracelet/Strap: Leather Gender: Men's Watch/Unisex Warranty: Manufacturer's Warranty Features: Tourbillon Power Reserve Small Seconds Shop other beautiful pieces in our Greubel Forsey collection For inquiries on the piece please contact: boutique@shsilver.com