At her home in Moonachie, New Jersey, Quintero showed some of the coins that could have value: a few buffalo head nickels, an Eisenhower silver dollar, and at least one coin that dates back to 1887.

If you do find old currency or something that could potentially be valuable, one word of advice: Don’t clean it. “Cleaned ...

The old cliché about finding rare and valuable coins is that you should start by digging around in your sofa. That’s not necessarily bad advice. However, chances are the only loose change you ...