Manchukuo was controlled by Japan until Japan surrender to the Allies in 1945. Manchukuo was then returned to China and the stamps of China replaced the stamps of Manchukuo. Some examples of Manchukuo stamps is as follows:
Common Symbol and Letters on Manchukuo stamps
(The above letters are usually the first three letters found on some Manchukuo stamps.)
Or
(The two sets of letters listed above are usually the last three letters found on some Manchukuo stamps.)
(The above Symbol or Crest is usually found on some Manchukuo stamps.)