This is the main reason why I've never bought one of these drawings, while there cool and all there's a huge risk of paying decent money for one and then there's multiple original copies of it that may have been made that are either "unearthed" or copies that were made so that more could be sold down the road. It's way too risky, but too each there own. I've paid up for original prototype whatever over the years only to have it later reproduced for the masses. It's a hard thing to swallow and it pisses me off quite frankly. So I've decided to just stay clear of these particular drawings and put something else on my walls that hasn't or can't or wont be reproduced because I'm probably the only person out there that likes whatever it is.......LOL.
John