Collectible coins include a variety of types, among which are dimes from the United States. The 2003 Denver Mint issue of dimes, often referred to as 10c coins, can be found in rolls and may feature certain mint marks that increase their value to collectors. These coins are part of the Roosevelt dime series, which has been produced since 1946, and the Denver mint mark indicates they were minted in Denver, Colorado. Collectors often seek dimes based on their condition, rarity, and demand in the numismatic market.