I’ve got a quarter that I first thought was a slug…but upon further investigation I noticed that it was a quarter that was only struck on the very edge. You can make out an arc that would be the boarder of the quarter. On the sides you can definitely tell that it is a quarter by the copper clad. The rest of the quarter is smooth…what would something like this be worth??
First of all, we'd need to see a picture of it in order to determine whether it's really a mint error.