A printing error made around a decade ago resulted in millions of $1 bills with a rare misprint. Here's what to look for.

You better think twice before you spend that $1 bill in your wallet ... resulted in dollars printed with duplicate serial numbers, technically counterfeiting their currency.

Featuring a low-profile design, the Bellroy Hide & Seek Low Wallet is made to fit short currency like US dollar bills. A compact cardholder made for daily journeys, the Charlie Cardholder Wallet ...

Consider These: 7 Lesser-Known Collectibles Worth Thousands of Dollars ... of your wallet to see if anything is worth more money than its face value. Here are the most valuable bills still out ...

The currency issued by the Federal Reserve Bank will always be worth the amount it says, whether the American dollar has gone up or down. However, collectors place extra value on rare bills in ...