Collectible coins encompass a variety of categories, including historical coins, commemorative issues, and bullion coins. In the United States, notable examples include coins minted by the United States Assay Office of Gold, especially during the California Gold Rush era, such as the G 20 coins from 1853. These coins often feature specific designs and hold significant historical and monetary value, making them sought after by collectors and investors alike.

Item Denomination Series Year Mint
1853 G$20 U.S. Assay Office TWENTY D., 884 THOUS, K-17 G$20 United States Assay Office of Gold 1853 California
1853 G$20 U.S. Assay Office TWENTY D., 900 THOUS, K-18 G$20 United States Assay Office of Gold 1853 California