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Sadly I got it a few years ago and can't remember where from.

I think this is similar
...

That kind of finish can be achieved with hand sanding and final buff with polishing compounds.
I have done it a few times and the progression goes something like that, for me:

sand
paper ...

Your razor is hollow ground, I am not sure a regrind is an option. Just do a progression of sandpaper and clean it up.