A manufacturing error on the 1999 Georgia state quarter has increased the coin’s value, and some collectors are paying as much as $10,000 for the affected 25-cent pieces.

These eight quarters may look like just pocket change. But in the right hands, they could be exchanged for a fortune.

When that coin crossed the auction block, it realized $15,862.50, a figure that has since become shorthand among collectors for how extreme mint errors can rewrite the value of a modern quarter. The ...

You might not think twice about the loose change rattling around in your pocket, but a handful of quarters from recent decades are suddenly catching the attention of serious collectors. Some quarters ...