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1979 no mint mark nickel - double strike?

pls. help me out with this coin. Thank you.
1
pls. help me out with this coin. Thank you.
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correction 1978 no mint mark nickel
Not an error of any kind. It is suffering from corrosion, possibly acid
but the cause doesn’t really matter, it is still damage.
No mint mark means Philadelphia.
Thanks for the info!
that's what a double strike nickel looks like
Double struck in the collar looks like this: