Collectible coins, particularly from the United States, can feature specific designs, mint marks, and historical significance that greatly affect their value. A common type is the dollar coin, which may include issues like the Presidential dollar series or the Native American dollar. A roll typically contains 25 coins issued by the Philadelphia Mint, and coins from 2010 might represent a particular design year, adding to their interest for collectors. Condition, rarity, and demand play key roles in determining the market value of these coins.