Sorry, no idea about who manufactured it, nice Solingen blade, should be an excellent razor.

I can't place right now which member tags his posts something like "perfection ruins good" --- I love it and I try to remember it when I look at a razor. Try a couple dabs of Flitz or Maas on a strip of 2500 wet/dry sandpaper, and give the blade a good rub, see what you've got. Losing the engraving on this would be a shame. That little sandpaper/Flitz trick will give you a real good idea what you're dealing with without getting at all destructive. You can always bully it later if you want, but it's old ...going after perfect is likely to disappoint you. Have some fun with it.