You can get marks like that on genuine coins e.g. circulation damage, die cracks, lamination issues etc.
If you're concerned about authenticity, you need to weigh it (to at least 0.1g), measure it and look at the whole coin, including the edge.
If you're concerned about authenticity, you need to weigh it (to at least 0.1g), measure it and look at the whole coin, including the edge.





















