Interesting information. I have some notes, wondering if there is a guide or publication that would explain various series, things to look for (i.e. prefix)? I also have a few that have 2 hole punches near the top, do they mean something, like specimen, or no longer valid?
There are a couple references. WWII Remembered by Schwan and Boling has extensive coverage. Australian author Brad Hale just published the second edition of his book on Japanese Invasion Money.
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