Collectible coins include various types such as proofs, which are specially minted for collectors with high-quality strikes and finishes. In the United States, proof sets are issued by the U.S. Mint, often including coins from different denominations. The 1988 Proof Set, minted in San Francisco, features coins from that year, including the iconic Lincoln penny (1c) and other denominations that showcase exceptional detail and mirror-like surfaces, making them highly sought after by numismatists.

Item Denomination Series Year Mint
1988-S 1c-$1 Prestige Proof Set 1c-$1 Proof Sets 1988 San Francisco