Collectible coins encompass various types, including commemorative coins, bullion coins, and circulating coins. In the United States, coins such as the 1 cent (1c) and 50 cent (50c) pieces hold special significance for collectors. Proof sets, particularly those issued in 1968 by the San Francisco Mint, feature coins that were struck under higher pressure and with polished planchet surfaces, resulting in a mirror-like finish. These sets are sought after for their quality and pristine condition, often appealing to numismatists and investors alike.

Item Denomination Series Year Mint
1968-S 1c-50c Proof Set 1c-50c Proof Sets 1968 San Francisco