Oh nice this is a trick Quarter like a magic trick coin or a coin you can use betting and always when if you choose heads :) I've heard of these but not ever seen one.
Or...or its a coin error. But I believe its not possible since there is an obverse and a reverse die.
I could be wrong however.
Do you like the new site upgrades? Seen any errors? Or do you like the old one from a few days ago?