In 1999, IWC released the Da Vinci Tourbillon. It's powered by a hand-wound movement with a tourbillon escapement, similar to the original 1985 model. The watch came in yellow gold (200 pieces) or platinum (50 pieces), with a special edition 'Four Seasons' model in yellow gold (20 pieces) and a 'Leonardo' model in yellow, rose, and white gold (50 pieces each). The dial could be marked in German, Italian, English, or French, but this may not be clear in our images. The Da Vinci Tourbillon reference IW3752-22 is part of the Leonardo series, honoring 550 years since Leonardo Da Vinci's birth. Its