The Quadruple Tourbillon was Greubel Forsey's second Fundamental Invention and features four tourbillons – composed of two Double Tourbillon 30° systems – working independently in pairs and linked by a spherical differential that transmits the average of their rates to the gear train and time display. For more visit: http://www.wthejournal.com/en/en-direct/article/greubel-forsey-presents-the-quadruple-tourbillon-secret

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