I have heard that less than 100 were made and sold. I've seen one in person, and have seen a few come up for auction on gunbroker. I believe that Victor Tibbets was the revo gunsmith for Wilson. I know he continued to offer the 66 in the exact configuration that was available from Wilson for some time, however, I don't think he is currently offering them. He is an exceptional gunsmith, and if you are interested, you might want to contact him to see if he has any still laying around.
DK.