As an Indian it is surprising that they issued ‘The Japanese Government Rupee!’
They did take a very centralising position in the Andaman and Nicobar islands and they had overarching presence in the North Eastern States during the second world war!
In the Indo-Burma region they minted the currency and it held value for a short time.
The Japanese invaded Burma in January 1942 and conquered Mandalay on 21 May 1942, forcing the British to retreat into India.
The Japanese held Burma until the second Allied campaign of 1944. In 1942, the Japanese issued paper sculpture currency. Like most Japanese colonial currency from this period, a letter code was used on the notes.
The first or top letter “B” indicates the note was printed and issued for Burma. The second letter or letters indicate the block (or printing batch) of the note, there are single letter blocks and double letter blocks for Burma, with the latter two letter blocks being identified by a hyphen separating the letter "B" from the block letters.
P. S. Burma was also part of the British India till the Britishers decided to vivisect it away as a separate crown province in 1937 which later became an independent nation.