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.
Economy of North Korea
It has also been estimated that imports of arms from the Soviet Union in the period 1988 to 1990 accounted for around 30% of the North Korea's total imports, and that between 1981 and 1989 North Korea earned approximately $4 billion from the export of arms, approximately 30% of North Korea's total exports in that period. The nominal dollar value of arms exports from North Korea in 1996 was estimated to have been around $50 million.