They figured out a few years later, that there was an issue for the planchets were plated, they didn't get a good enough rinse. This allow the zinc dust to be plated over creating the issues you are seeing on your coin. So they are not a valuable error, but something to avoid like split plating on coins you would buy. If something is distracting on a coin, pass. It would be harder to sell to the buyer if there is an issue with a coin.
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