I just recently read about some of the errors on the new presidental dollar coins. There is a great, easy to read, book on error coins  by Brian Allen and Ken Potter. It is called: Strike It Rich with Pocket Change.

One of the most interesting errors are found on the edge of the coins. You see, the new coins have writing on the edges. Some are missing writing, for example and that makes it an error coin. Of course the book shows you great pictures and indicate other errors as well as the average value.

Why is this important?

There are collectors that specialize in error coins. They will pay for coins to add to their collection as well as sell coins that have certain types of errors. Trust me, after you read this book  you will never look at any coin, regardless of the date, the same way you did before.

Now if you want to really see some error coins that are selling just go to an online auction like Ebay and search for error coins. That will be fun and educational.