Collectible coins, such as the 1989 Denver quarter from the United States, are often sought after by numismatists for their historical significance and potential value. The 25-cent coin, part of the Washington Quarter series, features the image of George Washington on the obverse and an eagle on the reverse. Quarters from the Denver mint, marked with a "D," can vary in rarity depending on factors such as minting errors, condition, and demand. Rolls of quarters, typically containing 40 coins, are a common method for collectors to acquire multiple pieces at once while also considering their potential for appreciation over time.