The machining marks look like the tool used was remarkably dull. The surface finish looked as if it had been finished with an unbalanced angle grinder. The cutting edge was far from an edge that would only stain and scratch the metal it was used on. Even after all its imperfections have been addressed with files and whetstones, it is still unusable. Its angle is uneven which causes one edge to do all the work before I sharpened it and I couldn't straighten it afterwards.