A super nice, 7 Character, 5 & 10 Yen Imperial Japanese Government Military Bird and Dragon notes of March 1940. Following the Japanese invasion of China on July 7, 1937 the Bank of Japan Yen notes were used to pay the Troops and to buy local material in their newly conquered territory, these were at "par" with the circulating Chinese Yuan. The extensive Military operations led to high inflation in China and forced the Japanese Yen back into its homeland economy, which had a disastrous effect. The following year they put into circulation money called military yen, which was not convertible into 'homeland yen' and cost the Japanese nothing. On mainland China, these were eventually replaced with Reserve Bank and Central Reserve Bank issues, in fact produced by the Japanese from the captured printing facilities, but in Hong Kong & Hainan these Military Yen were used until the end of hostilities in 1945.