10 Won

South Korea switched the 10 Won from bronze to brass in 1970 as copper prices climbed globally, a cost-driven decision that affected dozens of minting programs worldwide during the same period. The change coincided with Korea's rapid industrialization under Park Chung-hee's export-driven economic plans, when coins were circulating in volumes the earlier composition couldn't sustain economically.

Later dates in this series — particularly toward 1982 — saw the design retired entirely in favor of a smaller, aluminum-clad issue, rendering the brass type obsolete after just over a decade of production.