Korean yen
The Korean yen was the currency of Korea between 1910 and 1945. It was equivalent to the Japanese yen and consisted of Japanese currency and banknotes issued specifically for Korea. The yen was subdivided into 100 sen. It replaced the Korean won at par and was replaced by the South Korean won and the North Korean won at par.
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.