Pennies are everywhere. While most aren’t worth much ... One of the biggest factors is the mintage number. Some mint marks are rarer (and more valuable) than others, and some come with historical ...

According to one expert, a rare 50p coin is the "most popular" in circulation and could be worth up to 100 times its face ...

Proof coins ... are rare and worth more. One with a beautiful deep cameo sold for $44,650 in 2017. Although there are many examples of the 1955 proof for the Franklin half dollar, they tend to be ...