This is very common on the 80 for some reason like on the back of a 92 the memorial bar will be splitting on the right side I think it is split platting where the coppper is seperating from the zinc.
Your "doubling" is concave. Doubled die doubling is never concave. In fact what you have is a trench around the letters - it's not really doubled at all. This rules out Machine Doubling.
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