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What at first I thought were European Mauser dummy rounds of some sort may be of Japanese origin.
If you are interested in this little investigation, click on the link to the Milsurps "Ammo" forum below:
https://www.milsurps.com/showthread.php?t=23066
Looks like a certain fellow was VERY interested in these oddities as he made me a price which was so good that I gave him a break and am selling them for a little less than he offered.
If you want more photos, speak up now, before they get gone!