Same guy that was selling the movie posters I think?  I don't know what those are worth, but I think there was an old school Dracula one for something like $1m  That's big bikkies for a piece of paper

But on topic, I think if you're going to make a claim like "mint" you open yourself up to some real scrutiny.  If you are any any doubt whatsoever or may not be the best person to call something "mint", I think it's better to use other adjectives and let the buyer decide.  Best to be thought a fool.......