Hello Detlef, Unfortunately I have to say that if it were mine I would leave it as is. The damage done by someone taking a grinder to the blade can be removed but at the expense of loosing quite a lot of metal, blade thickness and what is left of the patina and character that it has developed over the tears. The damage is now part of the unfortunate history of this piece. It is still a wonderful addition to your collection and thanks to you it will be getting the respect and care that it has been denied until now.
Best,
Robert
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