The half dollar is one of the most popular U.S. coins to collect. Though many aren't worth more than their face value, older ...

The most common pairs by far are: The Lincoln cent on the ... with only 25 to 50 known examples for each entire coin series. One 1990 example from the more common, but still rare, 11c pairing ...

However, some of the most valuable 50-cent pieces sell to coin collectors ... This is an extremely rare coin, and CoinCollecting.com suggested less than 12 are known to exist — and only 20 ...