The G 20 coin refers to a specific type of gold coin minted by the U.S. Assay Office in San Francisco, California, during the mid-19th century, particularly in 1852. The U.S. Assay Office, operated by Moffat & Humbert, was responsible for assaying and minting gold from the California Gold Rush, and these coins were primarily used for trade and investment. The G 20 coins typically feature distinctive engravings, including the inscriptions and the assay office's mark, making them sought-after collectibles among numismatists and investors. Their historical significance and scarcity contribute to their value in the collectibles market.

Item Denomination Series Year Mint
1852/1 G$20 Augustus Humbert K-9 G$20 U.S. Assay Office - Moffat-Humbert 1852 California
1852/1 G$20 Augustus Humbert K-9 G$20 U.S. Assay Office - Moffat-Humbert 1852 California