Stamped Half Cent

[Dig-MV]

Hello everyone. Found this sweetheart of a half cent and she has what looks to me like a counter stamp on her neck. From what I can read it is N?A could be NSA? I don't know if there is a big book of counter stamps or mint inspectors but any information would help and thank you

 

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[DCMatt]

I can't read any letters...

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Complete List of Merchant Countermarked, Counterstamped Coins: A-C

DCMatt