Collectible coins, such as the 2004-D Lincoln cent (1c) from the Denver Mint, are often sought after by numismatists due to their historical significance, rarity, and potential for appreciation in value. The 1c Roll from 2004 contains multiple examples of this coin type, which features the portrait of President Abraham Lincoln, a long-standing symbol of American heritage. Coins minted in Denver typically have a "D" mintmark, indicating their place of production, and can vary in demand based on their condition and minting errors. Collectors often focus on unique attributes, such as variations, mintage figures, and condition grades, to determine value.