Seth, welcome to the Forum, great and helpful collectors here.
I believe you are correct, it's refinished. I enlarged the first image and, to me, the sideplate is missing sharp corners around the raised part.
Please do the "hot pin test" to make sure the grips are original. "Black Widow" P.08's are bringing ridiculous amounts these days. As you probably know that term was given by an early collector to enhance values. The false story goes they were issued to the SS. Totally bogus analogy. Some will obtain the black grips and place them on properly era dated P.08's to obtain more $$$. So be careful.
G2
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