Question on Japanese Coin

I found a number of Japanese Bu (ichibu) rectangular coins in a shop recently and bought a couple because they were neat. These were the KM# C16 type struck 1837-1854. I was wondering if anyone knew if these were over-struck on existing coins at all? One of them shows clear signs of being over-struck on another coin. See the images below.





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Comments
Im not seeing quire what you're seeing...
I was hoping to hear more on this topic. Does no one know?
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