Up the challenge rating (and the value) by looking for state quarter errors to add to your collection. They're rare but rewarding.

Taking that extra second could help you get rich. Between 1999 and 2008, a new state quarter was released every ten weeks. Each state’s quarter featured an image representing it, along with the ...

STATEN ISLAND, N.Y. — Defects sometimes increase the value of coins and such is the case with some quarters intended to represent the state of Georgia and its iconic peach. Starting in 1999 ...