Pull any bill out of your wallet. See the dark green numbers on the top-left and top-right corners? Those are serial numbers, and some are more rare than others. If you happen to have paper money with ...

While most $2 bills are worth face value, some of the less-used currency could be worth significantly more. Depending on the year and how the paper note was circulated, some $2 bills are now worth ...

Paper currency doesn’t get as much attention on the collector’s market as coins, which have a metal content that boosts their value and sometimes date back to the earliest days of human civilization.