If you're hanging on to a $1 coin ... One Dollar" on the tail. There are many dollar coins in circulation and for sale right now, with some of the most popular being the Sacagawea Gold Dollar ...

Many valuable and rare coins from the 1940s remain in circulation today, including the Mercury dime, which was produced from ...

An example is the 1943 copper Lincoln penny, which was mistakenly minted during a World War II copper shortage and today is worth as much as $1 million. But there are also lesser-known coins that ...

Errors increase the value of collectibles ... was working on a new metal alloy for coins. The alloy had a gold tint that was eventually used for the one-dollar Sacagawea coins that came out ...