2 Mun chin

The 2 Mun "chin" designation refers to a weight classification within the Joseon cash coin system, which standardized mun coinage through the Sangpyeong Tongbo series beginning in 1678 under the Bureau of Craft. The nearly five-decade production window reflects continuous restrikes across multiple government foundries — the military bureau, the royal guard offices, and provincial mints all struck nominally identical pieces, distinguished today only by reverse mint marks.

Brass alloy use in this series fluctuated with copper supply disruptions tied to irregular Japanese trade through Busan's Waegwan trading post.