Collectible coins are often categorized by their type, mint year, and production location. The United States offers a variety of collectible coins, including denominations such as 1 cent (1c) and 50 cents (50c). Proof sets, especially those minted at the San Francisco Mint, are highly sought after by collectors for their high-quality finish and limited production. The 1990 Proof Set, which includes various denominations, is particularly notable for its clarity and luster, making it a valuable addition to any collection.

Item Denomination Series Year Mint
1990-S 1c-50c Proof Set 1c-50c Proof Sets 1990 San Francisco