I remember when these were mixed in with the other 10 guilder chips at the 21 table that was at the Amsterdam airport. There were very few and I bugged the dealer to pull them out for me. Think I had three different, but of course at that time no one knew how many different ones there were. I got one I needed at a chip convention, and the last, toughest one (can’t recall which one) I didn’t obtain until about two years ago.