Collectible coins, such as the United States 1 cent roll from 2002 minted in Denver, are sought after by numismatists and investors. This specific coin is part of the Lincoln penny series, which has undergone various design changes since its introduction in 1909. Cents from the Denver mint can be identified by the "D" mint mark, and their value can vary based on factors like condition, rarity, and demand in the collector market. Uncirculated or high-grade examples of these coins may command a premium.