Greubel Forsey Quadruple Tourbillon Secret

About this reference

The Greubel Forsey Quadruple Tourbillon Secret in platinum was introduced in 2012 as a limited edition of eight pieces, following the original 2008 Quadruple Tourbillon. This reference utilizes the caliber GF02s, which features four tourbillons coupled by a spherical differential. Two double-tourbillon systems operate independently; each consists of an inner cage inclined at 30 degrees rotating every minute, housed within an outer cage rotating every four minutes. Unlike the open-dial versions, the Secret variant conceals the mechanism beneath a solid gold dial, displaying only the power reserve, small seconds, and dual tourbillon rotation indicators. On the secondary market, these timepieces typically command prices between $350,000 and $500,000 depending on provenance. A notable auction result occurred in 2021 when a platinum example sold for approximately $475,000, reflecting its rarity and the technical complexity of the differential-driven movement architecture.