Collectible coins encompass various types, including those minted for circulation, commemorative issues, and error coins. In the United States, collectible coins such as the 1 One Dollar pieces can include iconic designs like the Eisenhower Dollar or the Sacagawea Dollar. Counterstamped coins are coins that have been stamped with additional designs or markings after their original minting, often to signify special occasions, promote businesses, or denote a change in status. These counterstamped varieties can enhance a coin's historical significance and collectible value.