Collectible coins encompass a variety of types, including commemoratives, bullion, and error coins. The United States Mint produces various series, including the America the Beautiful (ATB) Quarters, which feature designs representing national parks and sites across the USA. The 2011 San Francisco ATB Quarters include coins minted at the San Francisco Mint, often sought after by collectors for their unique finishes and limited mintage. A 25-cent roll from this series may contain multiple quarters featuring the same design, enhancing its appeal for both numismatists and investors alike.