I agree, it most likely was polished with something like silver polish. And the reason for not having a mint mark is because it was minted at Philadelphia mint.
I was wondering, because I saw few hours ago a post about a 1941 coin struck on brass. 1941 1 cent weight: 3.41g Composition: 85%Cu, 11%Zn, 4%Sn Mint error XF40 . But its hard for me to identify a brass coin...
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