Collectible coins can encompass a wide range of numismatic items, including those issued by the United States Mint. The term "1 Roll" typically refers to a sealed roll of coins, often containing 50 units of a specific denomination. For instance, the 2011 coinage produced in Denver may include coins from the Presidential Dollar series or other commemorative issues. Collectors often seek these coins for their historical significance, mint marks, and potential for appreciation in value. Coins from specific years and mints can be particularly desirable among numismatists.