Collectible coins are often distinguished by their rarity, historical significance, condition, and demand among numismatists. In the United States, coins such as the 1 cent (1c) are part of various collectible categories, including Proof Sets, which are specially minted coins produced for collectors. The 2021 Proof Set, released by the United States Mint, includes coins minted in San Francisco and features higher quality strikes and finishes compared to standard circulation coins, making them desirable among collectors.

Item Denomination Series Year Mint
2021-S 1c-$1 Proof Set 7 Coins 1c-$1 Proof Sets 2021 San Francisco