Collectible coins from the United States, particularly from the Denver mint, include various denominations and series that hold significance for collectors. A notable example is the 2004 state quarter series, which commemorated Illinois, known for its iconic design featuring the state outline and a rendition of the Clark Bridge. Rolls of coins, often containing 50 coins, are popular among collectors as they provide a complete set from a specific year or mint. The premium value of such coins can be influenced by their condition, rarity, and demand within the market.