Got lucky today at a militaria fair. I was standing talking to a dealer friend when a guy approached the dealer trying to sell something. The dealer said it was not really his thing and passed the object back, at which point I realised what it was and exclaimed "I'll buy it".
I am now the happy owner of one of these design masterpieces and I believe it is the 2nd off the production line (roughly 500 manufactured). I now have two (s/n 2 & 58).