These were the areas that concerned me. In the upper two areas, the surface looks sort of buckled (dented in and pulled out), more than I would expect on such a thick blade. In the lower area, again, the right edge seems to bulge up while to the left it is dented in. It could be the play of the light, but it looks more like a cumpling effect on a thin-walled hollow object than bends and grind marks on a solid one. It could be that the upper part of the blade thins considerably toward the edge, and it got badly bent, then bent back, creating the rippled effect.
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