I haven't ever seen one like this I noticed it when I was cutting up mint sets, the whole rim is silver like the picture not one spot of base metal does it happen often?
This came from a mint set? I would have said it was plated, but if it was from a sealed mint set then it couldnt be. Is it magnetic? It may be on a planchet from some foreign coin. Have you weighed the coin? It could also be that the copper is just covered by nickel.. this happens some times, but I have never seen the entire circumfrence covered. you cant see any copper on the rim anywhere?
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