SIHH 2011: Greubel Forsey Invention Piece 2
Greubel Forsey Invention Piece 2 In ten years, no less than six significant inventions have sprung from Greubel Forsey's EWT think tank, three of which (to date) have been celebrated by Invention Pieces (IP). In 2007, IP1 paid homage to the Double Tourbil...