At first, I just figured this was zinc rot, but it's kinda strange that it's on both tails of the "9's". The other question I have is, I see this kind of mint mark and date doubling a lot. (Especially on 1995s). What kind of doubling is that (referring to the "6" and "D")?
And yes, zinc rot is going to happen in one shape or another to most zinc cents. I put my money and time into copper and silver and steer clear of zinc cents.
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