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Can anyone help me with the history of such ideograms
Possibly compared to collecting, grains of sand on the beach.
There are a staggering amounts of differing overprints.
Not addressed in The Manchukuo Stamps Comm cancellations
(Helen K Zirkle)
You will find a huge example in "Manchukuo Stamps"
(MLO's)
Manchurian Local Overprints 24th August 2021 L Mien Po
A set of 5 Monographs?
A bewildering amount of information.