Collectible coins refer to numismatics items that are sought after for their historical, artistic, or monetary value. In the United States, dimes, specifically the 10-cent coin, are part of the series minted since 1796. The 1969 Denver dime, featuring the profile of President Franklin D. Roosevelt, is notable within the series and can be found in rolls or as individual pieces. Collectors often look for specific mint marks, such as the "D" from the Denver Mint, which indicates the coin's place of production.