Collectible coins are items that hold value for numismatists and investors due to their rarity, historical significance, or condition. The United States has produced numerous collectible coins, including the Twenty Dollar gold pieces, known for their remarkable designs and precious metal content. The Braided Hair cents, minted in 1848, are notable examples of early American coinage, showcasing the artistic evolution of U.S. currency and often sought after by collectors for their unique features and historical context.