Collectible coins encompass a variety of categories, including specific denominations, minting dates, and locations. The United States dime, particularly the 10-cent coin, has various editions, with the 1990 Denver minting being notable for its unique characteristics. Collectors often seek out rolls of dimes from specific years like 1990 to find uncirculated or rare examples. The Denver mint is known for producing coins with distinct attributes, making such dimes valuable to numismatists.