Here are 20 rare state quarters worth additional value, according to Gainesville Coins, USA CoinBook and PCGS. Keep in mind that “error” coins — the ones primarily included on this list ...

That's because rare state quarter errors can give these coins a higher value. Some can be worth thousands, so grab your ...

Here are 20 rare state quarters worth additional value ... examine it carefully for any anomalies in the design. Look for ...