Collectible coins, particularly those from the United States, include a variety of types such as business strikes, proofs, and commemoratives. The proof coins, especially those housed in proof sets, are struck with higher quality and exhibit a mirror-like finish. The 1980 proof set is particularly notable as it includes special coins like the 1-cent piece, often referred to as the "penny." Collectors value such sets for their condition, rarity, and historical significance within the broader context of U.S. numismatics.

Item Denomination Series Year Mint
1980-S 1c-$1 Proof Set 1c-$1 Proof Sets 1980 San Francisco