Answer I imagine QUITE A BIT! Although, I am anything but an expert on coins, I can garauntee you that there are some really obsessed collectors out there who would give a pretty penny (pun intended) for that. The US mint (and the mints of most other countries as well.) are really obsessed with searching out the mis-struck coins and they also do a good job of preventing them from ever even happening in the first place, what you have there could be worth a LOT of money. SAVE IT!!!! (or give it to me if you feel like it.)
In reality ... If this is a mint error, it happened when two coin blanks entered the stamping machine at the same time. One would have Lincoln's head stamped on one side and a blank back, and the other would have the Lincoln Memorial stamped on the back and a blank front. Usually, this will also cause a mis-shaping of both coins, because there is twice as much metal in the press as there's supposed to be. These error coins can be worth well over $100, however... This error is magnitudinally rarer than the number of people asking questions about this type of coin. Therefore I have to believe that what you have is an altered coin -- something somebody altered after the coin left the mint -- most likely one of two pieces used for a "Magician's Coin", and has no value. See : varietynickels (dot) com/articles/twotailed (dot) htm
You can be sure by getting a professional first-hand appraisal. Check out the ANACS website for a list of shows where you can take your coin and get it examined : anacs (dot) com/shows (dot) html Good luck! (replace (dot) with . when copying the link)
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