Collectible coins, such as the 1961 Denver dime (10c), are sought after by numismatists for their historical significance, rarity, and condition. The 1961 Denver dime is part of the Roosevelt dime series, first minted in 1946, and features a profile of President Franklin D. Roosevelt. The Denver mint mark indicates that this particular coin was produced at the Denver Mint facility. Dimes from this era can vary in value based on factors such as minting errors, demand, and overall condition, making them popular among collectors.