1 Mun Mu, Heaven Small Type

The "Heaven Small Type" designation distinguishes this issue from concurrent Mun production by the position and scale of the Cheon (天) character on the reverse — a cataloging distinction that reflects the chaotic final decades of Joseon minting, when multiple government offices struck coins simultaneously with no meaningful standardization between them. By 1881, the dynasty was less than a decade from the monetary reforms that would render the Mun obsolete entirely, replaced under Japanese-influenced restructuring by the Yang system in 1892.