Demand for early copper and Colonial-era numismatic treasures drives strong results in Heritage Auctions' July 13 Early Copper & Colonial U.S. Coins Showcase Auction
Frederick Kohler opened the State Assay Office at San Francisco on May 13th, 1850. Six ingots have been reported from the San Francisco State Assay office; however, only four of these have been seen in recent memory (Kagin-1, Kagin-3, Kagin-4, and Kagin-5). Presumably, the other two examples no longer exist. Each ingot is unique, bearing the State Assay Office’s stamp, the year of manufacture (all are 1850), fineness expressed in carats, weight expressed in pennyweights, and value. Of particular interest is the $50 Kagin-5, which is the earliest $50 piece in the U.S. series.
Obverse Description
F.D. KOHLER, STATE ASSAYER, CAL, 1850 $45.34 DWt. 49 ¾ CARAT 21 1/2
Reverse Description
Blank
Catalog Information
View more data, info, and visualizations. Get access to retail and wholesale pricing as well as auction data.
Greysheet News
First known proof example of Overton 101 variety surprisingly found in consignor's collection.
In continuing celebration of the nation's 250th anniversary in 2026, the United States Mint will embark on a "Best of the Mint" program.





