Hello Detlef,
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And it has maybe a blade repair and I think that someone has cleaned the blade with acid, I will try to polish the blade a little bit and etch it maybe.
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Yes, that blob at the base of the blade looks weird - please keep us posted when you receive it!
The blade finish may be intentional/original; I'd try to restain it first before polishing since it will be tough to obtain an even finish.
Regards,
Kai