Collectible coins include various types such as dimes, which are worth ten cents in the United States. The 1992 Denver mint mark dimes are part of the Roosevelt dime series, introduced in 1946 and named after President Franklin D. Roosevelt. These coins can be found in rolls, such as a 10c roll, which contains 50 dimes. Collectors often seek specific mint marks and years, such as the 1992 Denver dime, for their numismatic value and historical significance.