Looks like a stain/residue on the coin. Is it incuse in that area? If not, then it is probably a stain/residue on the coin. A rinse under water might remove it. Possible milk that dried? I see it on other areas of the coins devices.
A die crack is raised. This is incuse. Sot it is either damage or a struck through. In the depths of the channel is is rounded or jagged? Ragged may mean damage. Rounded might mean a struck through something. Wire leaves a nice rounded mark. Thread also the same, but fiber can be squared. I see it running over the rim. So it may be damage.
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