1968 (P?) US Quarter. It looks like the word liberty has been misprinted because the word "liberty" at the top is cut off at the top of the coin. The "United States of America" on the back also looks like it has the same problem but not as noticeable. Is this coin worth anything?
Sometimes a person will take a heavy object like a hammer and tap on the edge to flatten a coin. Looks like you have one. Not an error but PMD - post mint damage Also..coins are not printed but struck or minted at the US Mint. Paper Currency is printed. Worth...25C
They do it sometimes to make rings. I want to share this webpage with you - http://www.instructables.com/id/Make-a-silver-ring-for-25-cents/