U.S. Assay Office / Humbert (1851-1852)

About This Coin

Augustus Humbert, appointed United States Assayer of Gold in California in 1851, produced some of the most iconic and valuable pieces in American territorial gold coinage during his 1851-1852 tenure. Operating from San Francisco under federal authority but outside the formal U.S. Mint system, Humbert struck the famous $50 octagonal "slugs" — massive gold pieces that became the standard unit for large transactions in Gold Rush California — along with smaller denominations that bore his name and the U.S. government's imprimatur. A remarkable auction result of $1,058,000 in MS68 grade at Heritage Auctions places Humbert's finest pieces among the most valuable coins in American numismatics. The $50 slugs are particularly celebrated: weighing approximately 2.5 ounces of .887 fine gold, they were produced with the engine-turned reverse pattern that gave them a distinctive appearance and served as an anti-counterfeiting measure. Humbert's appointment represented the federal government's attempt to impose order on California's chaotic private gold coinage market by providing an officially sanctioned assayer whose stamps would guarantee weight and fineness. His operation bridged the gap between purely private coinage and the establishment of the San Francisco Mint in 1854, and his pieces carry a quasi-official authority that distinguishes them from other California territorial gold. Collectors regard Humbert pieces as among the most historically important and visually impressive items in all of American numismatics.