I agree that the coin may have had some PVC damage, but it was a very nice pickup! After closer examination of the pictures, I personally believe that this coin is AU. That is probably why the dealer offered $300 for it. I imagine that this coin will be dipped and sold as an nice AU for aound $500 - $550.
that coin was EF - AU is pushing it. but what do i know, i'm a n00b regardless, $280 profit for 5 minutes work - that's nice. did i mention my consulting fee? -Steve