Collectible coins encompass various types that appeal to numismatists, including historical, commemorative, and bullion coins. Specifically, the 1940 Dime, minted in Denver, is part of the Mercury Dime series, which was produced from 1916 to 1945. The 10c Roll refers to a roll containing 50 dimes, totaling $5. The Denver Mint produced these coins, which are sought after for their numismatic value and historical significance. Collectors often evaluate the condition, rarity, and demand of these coins in determining their worth.