If that isn't some sort of residue, it could be a tool mark / die gouge? These are tiny coins, so the mark would look relatively large.
I have developed an interest in world coins that were produced by the U.S. Mint, especially during the WWII era. I'm slowly gathering a set of them myself.
"Nummi rari mira sunt, si sumptus ferre potes." - Christophorus filius Scotiae
Yes world war 2 coins are interesting alot we're melted during the war, I have many different world coins from this era although this is a interesting one.
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