Collectible coins, such as those minted by the United States, often hold value beyond their face value due to factors like rarity, historical significance, and condition. A specific example is a 2018 Roll of Dollars from the Philadelphia Mint, which reflects the production techniques and designs of that year. These coins may include various denominations and can appeal to numismatists and investors interested in both contemporary and historical U.S. currency. Collectors often seek out such items for their investment potential and aesthetic appeal.