Mark Lovmo writes:

In the nine years from 1965 to 1974, the Korean Mint had gained progressively advanced capabilities in manufacturing coins, ranging from striking coins, to plaster cast engraving, to producing the working dies and pattern coins, among a myriad of other involved processes. By the early 1970s, the Dongnae factory was manufacturing coins with mintages in the hundreds of millions. With an eye towards establishing minting contracts with foreign governments, the Mint incorporated the English title, the "Korea Minting and Security Printing Corporation" (Komsco) in 1971. Its first overseas contracts involved the printing of hundreds of millions of excise stamps for Thailand in May 1970, followed by the minting of 200 million Taiwanese 1 Yuan coins (Y-536) in February 1973.

It was around this time that the government had decided to construct an entirely new, up-to-date facility capable of conducting the full range of manufacturing processes required for a world-class mint operating at peak technical capacity. Construction for this new minting facility was completed on July 4, 1975 in Gyeongsan, near the city of Daegu, in the Southeast of the country. Prior to its official completion in July, the new factory had already begun banknote-printing operations in January.

The country's coin-manufacturing operations officially transferred from the old Dongnae coin mint (which closed its doors) to the Gyeongsan mint on April 30th that year. With this new facility in place, Komsco aimed for complete self-sufficiency. It was with this objective that the government tasked Komsco with the minting of South Korea's very first locally made commemorative coins almost as soon as new coin mint came online.

To read the complete article, see:
The 30th Anniversary of Liberation 100 Won Commemorative Coin (1975) (http://dokdo-research.com/thirtyanniversary.html)

To read the earlier E-Sylum article, see:
MARK LOVMO'S ARTICLES ON SOUTH KOREAN NUMISMATICS (www.coinbooks.org/esylum_v17n51a27.html)