I can't tell if it's incomplete plating, pre-strike damage (that removed the plating), or a stuck-in piece of zinc or similar-colored metal. If there's a narrow fissure flanking the silvery piece of metal, then it's the last.
I think he meant that if there is a narrow (and perhaps shallow) groove on either side of the exposed zinc, then it is a stuck-in piece of zinc, or similar colored metal.
That's just my interpretation of Mr. Diamond's analysis.
That's a very cool looking coin. I haven't seen one like it before.
Maybe a piece of plating was on the planchet before it was plated? After plating the piece of foil that was obscuring the plating in that area fell off. I found in a 1986 mint set one had a piece of foil plaing on the coin. But I wouldn't see no plating below the foil. But I left it in the sealed cent set.
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