Hi Rick,
No I don’t think they used this method, I am afraid the grind marks were applied later – I am sorry to say. I will however not tell you what I think should happen to who’s who did it, or Andrew will send me into outer space

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I have a beautiful Tanjore katar, where the blade has been treated with acid, and it has taken me many, many hours to make it look all right. Someone who could do a thing like that should he hanged, shot, quartered, skinned or something else – sorry Andrew

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Yes Rick, it is unfortunately true, that many weapons are badly mistreated before they are sold – alas.
Jens