Ever come across a U.S. coin with two heads or two tails. I bet you have. They are sometimes a double headed coin, or a magician coin. As a magician would use a coin like this in his performance to trick his audience. Double headed quarters are the ones most often come upon.
These are coins that are made outside of the Mint by combining two normal coins together. This is usually accomplished by grinding one coin down on one side and edges and inserting it into another coin that has been slightly dished out the same way. You can usually tell by examining the inside edge of the rim. Since the coin was altered after leaving the Mint, a double head coin or a double tailed coin is not a legitimate Mint Error which also means that they have no extra collector value.
For a deeper dive into Fake Coins, Counterfeit Coins, and Altered Coins click here.
