I just got this from a world coin lot on
ebay.
It's a 1943 brass threepence from the UK.
If you look at the letters OMN in the legend, you see what looks to me like extra metal/cud. I don't think it could be damage to the coin, since the O is struck on TOP of the extra metal, and the M is underneath.

Some pictures:



And here's the back. Quite normal-looking.

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