I found this on ebay. Way to much for me. http://cgi.ebay.com/Transformers-G1-autobot-dinobot-SWOOP-PROTOTYPE-mint_W0QQitemZ6018484688QQcategoryZ4696QQrdZ1QQcmdZViewItem
Yeah, this is the second time this has been up this year, and the pics are the same ones as the last time it was up. Can't remember if this is the same seller or if it actually sold last time, but I remember it was bid up to over a couple thousand. If it's what it claims to be, it's a rare piece indeed. I wonder if it was a true test shot from G1 (circa '84), or if they were just retesting the old mold at the onset of G2 to see if this guy was still viable, in which case they would have then changed the date stamp on him.