Greubel Forsey’s Invention Pieces

Invention Piece 1 (IP1) 2007 Invention Piece 1 features the Double Tourbillon 30° mechanism with a new movement architecture. Red and blue triangles indicate the time under a large polished tourbillon bridge, with a small seconds dial and a ‘power reserve indicator’ above.

The Invention Piece 1 embodies Robert Greubel and Stephen Forsey’s wish to honour the Double Tourbillon 30° and to raise the bar yet another notch by opening up whole new vistas for their first major invention.

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.

The Quadruple Tourbillon is honored, with Invention Piece 2, focusing on its innovative mechanism through a completely new technical architecture. The movement assures full visibility through the sapphire crystal, convex sapphire display back and lateral window. Two Double Tourbillons are presented head-to-tail, allowing the mechanisms to be appreciated from all angles.

Invention Piece 3 (IP3) 2009 The Tourbillon 24 Secondes is the mechanism highlighted by Invention Piece 3. A large 24-hour sub-dial dominates the dial side, with hours indicated by a red triangle. A smaller blue triangle indicates minutes. Small seconds are at 5 o’clock. Opposite the tourbillon at 8 o’clock lies a power reserve at 2 o’clock. Four gold dial plates on the dial are engraved with a message in French from Robert Greubel and Stephen Forsey.

Invention Piece 3 pays homage to Greubel Forsey’s third invention with a fast-rotating Tourbillon 24 Secondes inclined at 25°. The time display features a large 24-hour dial outside concentric minutes and a small seconds dial at 5 o’clock. An off-centred power reserve indicator at 2 o’clock visually balances the tourbillon at 8 o’clock, which is also visible through the lateral window.