The vertical sanding marks are probably original finishing marks. I've seen a number of blades from the 19th century and later finished by powered grinders.
A lot of American, French English and German blades bear this trait. Yours might be a bit more pronounced, but, I will try to find some examples and post them.
This allows for more precise finishing of the end of the fuller and ricasso.
I wouldn't polish them out, unless you just want a nice, shiney blade.
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