Grease mixed with debris like sand or grit that leaves the surface rough. But even grease can prevent a strike on the field with out the rough affect. Even inside devices this can happen.
Great photos coop thank you I always appreciate the extra time you take to include them. I just never noticed it until a couple of week ago on a Utah quarter (which I just set aside because it was different), then only 2nd time seeing it yesterday so I figured I would inquire on it.
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