The Greubel Forsey Double Tourbillon 30° was introduced to the market in 2004 after four years of research and development. This revolutionized the tourbillon system and the double tourbillon is essentially two tourbillons composed within each other. The exterior tourbillon is inclined at 30° and rotates in 60 seconds and the inner tourbillon carriage rotates every four minutes. This ground-breaking invention permanently compensates the rate of gravity-induced errors in the escapement and oscillator system.

Offered in like new condition, the present watch is known as 'The Secret' as the double tourbillon 30° is hidden behind the dial. This mysterious and discrete design was first introduced by Greubel Forsey in 2008 and is further enhanced with a power reserve feature.