Collectible coins, particularly in the realm of the United States, often include varieties such as commemorative coins and gold pieces. The modern commemorative gold coins are issued by the U.S. Mint to honor significant events, individuals, or themes in American history. One notable denomination is the twenty-dollar gold coin, which has undergone various designs and iterations, primarily during the late 19th and early 20th centuries. These coins are prized for their artistic value and the gold content, making them popular among numismatists and investors alike.