Collectible coins from the United States can encompass a variety of denominations and designs, including those issued by the Philadelphia Mint. A roll typically contains 50 coins of the same type or year, such as the 2004 presidential coins or state quarters. These coins often hold numismatic value beyond their face value due to their rarity, historical significance, and demand among collectors. Dollar coins issued in 2004 may feature notable designs, making them desirable among both hobbyists and investors.