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@gereonb
Toptube damage like that comes from head on crashes, and it normally comes with some Downtube damage too.
I have a Colnago that has some serious top/down tube ripples but i still ride it like the idiot that i am.
https://www.lfgss.com/picture.php?albumid=2649&pictureid=16121
You can replace the top tube by unbrazing it from the Lugs and brazing in a new one. A double butted raw Toptube will cost about €15 and then add whatever it costs in labour for the brazing.