Spotting rare coins is a lucrative hobby for some, but it takes patience and impeccable eyesight. There are millions of dollars floating around in this market, many of which may be undiscovered.

Dimes make dollars, they say — but some dimes are worth more than a few dollars. As Gainesville Coins detailed, there are U.S. dimes that have sold for more than seven figures in the past. Up Next: 7 ...