Well that does look like a struck through gritty grease. My apologies, when I sat that thing at the top of the coin, I got tunneled in and forgot to look at the back of the neck.
Incuse marks would be struck through debris. The roughness of the wad of what ever left that mark on the fields. If it wasn't there during the strike, the coin would have been normal. Not a premium for this, it make the coin a problem coin. So it is not a plus for the coin. Even if the debris was there, it probably would not raise eyebrows.
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