it looks like a stain on the clad layer. Here's a link to a coin that I have with an "Improper Cladding" error (misspelled on the slab as "Imporper" by PCGS.) It shows a hard edged dividing line between the missing cladding and the exposed bright red copper. http://goccf.com/t/366857
ANA ID: 3203813 - CONECA ID: N-5637 Clean a coin that may be worth collecting? Please DON'T! When in doubt, leave it dirty!!
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