Invention Piece 2 (IP2) 2011
The Quadruple Tourbillon mechanism is at the heart of Invention Piece 2. The two double tourbillon systems are configured head-to-tail and are coupled by a spherical differential. A sub-dial at 5 o’clock features a red triangle indicating hours while a concentrically-configured rotating disc indicates minutes. Small seconds are at 10 o'clock and there is a power reserve indicator at 11 o'clock.
Read more about this topic: Greubel Forsey
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