to quote your article on The Evolution of Vacheron Constantin Sports Watches from waaaaay back in 2009: "Chances of seeing a tourbillon or minute repeating Overseas in funky metals is close to zero..." and we've seen titanium and tourbillons since then. As usual, VC remains predictably unpredictable! Di has recently taken up with a ceramic watch and I can see how that material would make for a fascinating choice for the OS as well.