1 Mun Kum

Cast — not struck — at one of the numerous provincial military offices authorized to produce cash coinage under the Joseon dynasty, this issue dates to a period when minting rights were deliberately distributed across dozens of government bureaus to manage chronic copper shortages. Each furnace used a different reverse mint mark, making KM#340 one of dozens of closely related varieties produced under the same nominal authorization. The specific casting bureau can often be confirmed only by that reverse mark.