No. 20. Greubel Forsey – Quadruple Tourbillon

Price: $690,000
The Quadruple Tourbillon Secret was presented at the 2012 SIHH, Salon International de la Haute Horlogerie, in Geneva. While the full dial of the QT Secret hides the two double tourbillon oscillators below, the two 4-minute indicators on the dial provide a hint of the complexity underneath. Turning the timepiece over enables the four tourbillons systems presented head to tail and coupled by a spherical differential to be appreciated at a glance through the display back.
No. 19. Vacheron Constantin – Malte Tourbillon Regulator



