Collectible coins encompass various types, including historical, commemorative, and bullion coins, often sought after for their numismatic value, rarity, and historical significance. The United States of America has produced numerous collectible coins, including those manufactured by the U.S. Assay Office, such as the Moffat & Co. coins. These coins are notable for their association with the Colorado gold rush and the role of the Moffat Company in minting gold bullion, contributing to their desirability among collectors. G-20 coins generally refer to issues related to the Group of Twenty, often in the context of international commemorative coins, while U.S. coins are categorized by mint marks, historical context, and material composition.

Item Denomination Series Year Mint
1853 G$20 Moffat & Co. K-19 G$20 U.S. Assay Office - Moffat & Co. 1853 San Francisco
1853 G$20 Moffat & Co. K-19 G$20 U.S. Assay Office - Moffat & Co. 1853 San Francisco