Improperly Annealed Nickel?

Looks about right to me.

 

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I think so.
1959 nickels are known for it so it is very likely.

 

@Paddy54 Your thoughts also?

 

The image isnt the best but the color looks right... and this was one of the better known years for black beauty Jefferson nickels. But
Here's 1 I just imaged. I say yes it is

 

Some are darker in color other lighter grey.... but over time as well where stored makes a difference.
Tommy didn't i send you some?

 

The one I found looks light

 

Here it is with less lighting. I wanted to show you the luster that was left on it.

 

Sure looks like it could be. And that date range is known for that.