Collectible coins can include various types such as proof sets, which consist of specially minted coins intended for collectors rather than general circulation. The 2008 San Francisco Proof Set, for example, features coins that have a mirror-like finish and are struck at the San Francisco Mint, showcasing designs from the United States. This set typically includes a 1-cent coin (penny) along with other denominations, all produced with higher quality standards, making them desirable among numismatists.

Item Denomination Series Year Mint
2008-S 1c-$1 Proof Set 14 Coins 1c-$1 Proof Sets 2008 San Francisco