Clips that result in partial coins happen at the blanking stage, not at the planchet stage.
What needs to be done here is to determine the radius of the arc, and the radius of the coin.
If they prove to be the same, that would lend much stronger evidence that the coin blank had been hit twice by the blanking punch, and not post mint damage.
Although I tried, I was unable to determine the radii from elliptical on screen pictures. Would be much better if the pictures are bigger, and the image perpendicular the lens axis.
The other possibility to consider that that if? it is post mint damage, is that the coin has been attempted to be cut by curved shears.
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I can see a tiny amount of wear on the high points of the design, both sides.
AU-55.