Short answer, the factory.
Elaborate analysis triggered by your question:
The strange look in the photo is due to playing with filters on my tablet combined with the low resolution available for posting on TSD. I enjoy messing around with filters and different light sources to see aspects of a razor that I can’t see with the naked eye (especially with my less than prime color vision).
So that is just the factory grind, enhanced by manipulating the image to bring out the history/orientation of the grind. I have used nothing other than my 50/100/200 diamond pasted balsa progression, linen, and leather to bring the edge up to fully ‘shave ready’. No stones, no films.
I just took a closer look at my current production straights, and a few of my vintage. I don’t but top end razors with a polished finish for the most part. All but my Legend Koroglu show some grind history. Boker, Aust, and Dovo a little less trace of coarse grinding. Golddachs and Klaas, a little more. My Wackers have a black oxide finish, but under that you can see the grind. The vintage razors vary a lot, but most show less obvious grind history than current production. Maybe more time spent on grinding and fewer aggressive synthetic abrasives back in the day? Or maybe it’s a Solingen thing?
Interesting where an enforced timeout and a loupe can lead. Or maybe not interesting.

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