A List Of More Than 100 U.S. Error Coins By Denomination - see all of the pennies, nickels, dimes, quarters, half dollars, and dollar coins with errors you should be looking for!
The 1999 Connecticut state quarter can be really valuable, especially if it's a Connecticut quarter error! See how much your Connecticut quarters are worth.
A mule coin is an error coin that has an obverse (heads side) design and a reverse (tails side) design that wouldn't ordinarily be on the same coin. See the most famous mule error coins!
All US coins made of silver by denomination + The most valuable silver coins by denomination + Dates the metal composition changed for each US coin denomination.