Collectible coins can encompass a wide range of types, including specific denominations, mint marks, and years of production. The United States dimes, specifically the 10-cent pieces, are a popular category among collectors. The 1980 Denver mint dimes, marked with a "D" mint mark, are of particular interest due to their limited production and potential variations in quality. These coins can be collected in rolls, which may contain uncirculated or higher-grade examples that enhance their value to numismatists.