I have no information about the manufacturer, but here's some educated guesswork, only relying on the bad pictures:
It is most likely Solingen made and probably made by ERN. The obviously high quality together with the design and naming makes me draw that conclusion.
The razor is definitely NOS. The engraving makes me guess that it is made before the First World War and it can be much older than so.
Yea, i think it can be ERN.
They have crown and sword, logo pretty close to this... Maybe they had different price and name depending on class of razor.
Sorry för my bad english
ERN had a very large number of brands, each directed to a specific target group and country. In our home country (we are both Swedes) ERN were often sold as Crown and Eagle. Is nothing wrong with your English. If you just mention that you're Swedish the regulars at this sub forum will recall my hurly burly and be positively surprised by your English.