I'm not convinced that the marks are the results of a powered grinding wheel. The marks are too patterned (narrow & broad marks) to have been ground. The pattern changes slightly along the blade as if they follow the contour of the blade and the edge taper. The edge looks rough ground due to the randomness of the marks and back & forth as one would use a grinder.
Are the marks on both sides of the blade? Are the marks along the full length of the blade? Would appreciate a pic of the entire blade. Also, can you get a micro shot of a mark pair?
What would be the purpose of modifying the blade so as to produce the marks?
I can't yet offer an alternative tool source of the marks; just that it's not from a wheeled grinder.
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