Struck Through What?

I have a few of these. They are also out of the same batch of 1964 cents I've been going through tonight. There's a little bit of randon texture that makes me think it might have been a piece of cloth. But I'm not sure.

Anyone have idea of what was struck through?

 

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probably not cloth... more likely grease or oil with some small metal bits in it.

 

Ah.... the "small metal bits" in the grease makes sense! Thanks, Matt. I just couldn't wrap my head around what else it could have been.

 

That would be my guess too. Could it have also been struck through a thin detached lamination peel from a previous planchet?

 

I would just call it debris.