Collectible coins, particularly from the United States, include various types such as bullion, numismatic, and commemorative coins. The 20-dollar American Liberty Gold coin, minted in 1879 in San Francisco, is part of a series known for its iconic design featuring Lady Liberty. This coin is highly sought after by collectors due to its historical significance and the gold content, making it a valuable piece in numismatic collections. The 1879 San Francisco mint mark indicates the origin and adds to its rarity and desirability among enthusiasts.

Item Denomination Series Year Mint
1879-S $20 $20 (Twenty Dollars) American Liberty Gold 1879 San Francisco