1948 Denver quarters are part of the Washington quarter series, which was first minted in 1932. These coins are typically composed of 90% silver and 10% copper. The 1948-D quarter features the obverse design of George Washington and the reverse design of an eagle. Collectors often seek out these coins in various conditions, with higher grades commanding premium prices due to their rarity and silver content. A roll of 25 coins would typically include 25 quarters from the 1948 D mintmark, potentially appealing to both numismatists and silver investors.