Collectible coins include various types such as circulation coins, commemorative coins, and bullion coins. In the United States, coins are often categorized by their denominations, including the 1 cent (1c) and 50 cent (50c) coins. Proof sets, produced by the U.S. Mint, feature specially struck coins with a mirror-like finish and high detail. The 1999 proof set includes coins minted at the San Francisco Mint, notable for their quality and limited production. Collectors often seek these items for their aesthetic value and potential appreciation over time.

Item Denomination Series Year Mint
1999-S 1c-50c Proof Set 9 Coins 1c-50c Proof Sets 1999 San Francisco