Is this really what the error looks like? http://i17.ebayimg.com/02/i/03/84/52/7a_1_b.JPG Because every Wisconsin quarter that I have had so far has looked like that, so I didn't think that they were errors since they were all the same...but in that auction, there has been 21 bids and the price was over $100. So I'm confused!
Hm, ok, after posting this on another forum, somebody gave me a link to a site about it. So I finally saw the difference.
