1951 proof nickel Question

So I purchased a 1951 proof nickel and Franklin half & a 1952 proof dime and quarter. For 35$ ( amazing price ) off a small auction site in the Midwest. I just want to double check with you guys . That the nickel has machine doubling on the reverse I’m going to say ? Or die deterioration . From what I’m learning, it doesn’t appear to be true “doubling” I apologize for lack of a over pic of the reverse. I’m not in front of the coin currently

 

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I will say Mechanical doubling.
Proof coins are struck twice so it's the effect it sometimes seen.

 

Is that a fingerprint on the coin?

 

clearly it's a fingerprint. LOL yes it might even belong to OJ Simpson.

 

someone say printed again ? Print and coin in the same sentence , no .

 

nice purchase

 

Yes to MD. Yes to a fingerprint.