Collectible coins, particularly in the United States, include various denominations such as the 1 cent (penny) and 50 cent (half dollar) coins. Proof sets, which are specially produced coins with a higher quality finish, are often sought after by collectors for their clarity and detail. The 1972 Proof Set, struck in San Francisco, features key coins such as the Lincoln penny, Jefferson nickel, Roosevelt dime, Washington quarter, and Kennedy half dollar, showcasing the intricacies of minting processes unique to that year and location. These sets are popular for both their aesthetic appeal and potential investment value.

Item Denomination Series Year Mint
1972-S 1c-50c Proof Set 1c-50c Proof Sets 1972 San Francisco