Collectible coins encompass a variety of types, including those issued by the United States of America, such as the iconic 1 One Dollar coin. Counterstamped coins, which are altered by the application of a stamp after their original minting, become unique collector's items due to their altered state and historical significance. The 1978 series includes various denominations and designs that appeal to numismatists, particularly those interested in modern coins and their collectible value.