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.
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.