Inspect them for mistakes/errors. Collectors love rare pieces, and nothing shouts one of a kind like mistakes minted on ...

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

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 ...