From what I've been told, there were less than a dozen made. They were built in Italy for Don Aronow. The only one I've ever seen belonged to Dr Santiago (Zero Cavity) His was in Don's office for years.
You must have seen the one on ebay. I was bidding but we lost power with 2 minutes to go!
I'm surprised it sold for what it did. It's an extremely rare piece of offshore memorbilia.