Don't dispair Detlef. It's still a wonderful piece, even with the grinder marks. With some fine sandpaper, P220 or finer, you can sand along the length of the sword until most of the marks are gone. then move to a finer grit, maybe 320 then 400 then 600. This will be very tedious, and will take some hours. But it can be done. Some may say to do nothing, and I might agree.
Good luck!
Steve
Edit: While I was composing my post, I see that others whom I respect very much suggested doing nothing. It is your decision.
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