Probably Fe/Ni and that is probably rust (iron oxide) leaching out (i.e., reverse side) not copper as from a silver-plated copper host Sheffield (GNL Class 1).
Quote: Probably Fe/Ni and that is probably rust (iron oxide) leaching out (i.e., reverse side)
Ah, that makes sense... The area on the reverse you were referring to almost looked like it had been a silverplate brass, but the rust explanation makes much more sense...
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