Errors increase the value of collectibles because a limited number go into circulation before it is spotted and corrected. This Georgia quarter is a big one.

Millions of Beatrix Potter 50p coins are rattling around in British piggy banks and coat pockets right now. A handful are ...

Thousands of hobbyists across the United States are walking into banks, buying rolls of coins at face value, and sorting through them for rare dates, mint errors, and silver pieces worth many times ...