Collectible coins, such as the 1991 San Francisco minted half dollars, are categorized based on various factors, including mint marks, condition, rarity, and demand among collectors. The 50-cent coin, or half dollar, features notable designs, often including figures such as John F. Kennedy or Benjamin Franklin. Collectors often seek specific rolls, such as a roll of 50 half dollars from a particular year or mint, which can increase in value over time depending on their condition and market interest. San Francisco mint coins, identified by the 'S' mint mark, are often prized for their quality and limited production.

Item Denomination Series Year Mint
1991-S 50c Roll 20 Coins 50c Roll Half Dollars 1991 San Francisco