Korean currency
The yen was the currency of Korea during the Colonial rule, from 1910 to 1945, and was issued by the Bank of Joseon It was equivalent to the Japanese yen and consisted of Japanese currency and banknotes issued specifically for Korea. It was replaced by the South Korean won at par in 1945, and by the North Korean won in 1947.
Postage stamps and postal history of North Korea
The first stamps of North Korea were issued on 12 March 1946: "Rose of Sharon" and "Samson Rock". Stamps prior to 1974 dealt primarily with subjects relating specifically to North Korea, its foundation, Kim Il-sung and other patriotic themes. After 1974, in a bid to bring more hard currency into the country, North Korea began issuing stamps with wide-ranging themes (such as Joan of Arc, airships, sports and wildlife) and using English descriptions.