Collectible coins encompass a wide range of types, including historical, modern commemoratives, and regional issues. The United States has a rich selection of fifty-cent coins, particularly the Modern Commemoratives minted to celebrate significant events or figures. One notable example is the 1991 San Francisco coin, which was part of a series honoring the 500th anniversary of Columbus's voyage, showcasing intricate designs and polished finishes that appeal to collectors. These coins are often sought after for their historical significance, artistic value, and potential for appreciation in the numismatic market.

Item Denomination Series Year Mint
1991-S (San Francisco) Modern Commemoratives 50¢ (Fifty Cents) Modern Commemoratives 1991 San Francisco