Thanks so much gentlemen for your inputs so far. France came also to my mind as possible origin of this razor. The shape of the blade and just the whole making - I find similarities in the other French razors I own (and I like the French A LOT)

Regarding age I tend to believe that it is not that old. Two reasons for this:

First, the near-mint condition. The scales are pretty much flawless. The blade did have some rust but this was not really deep. The largest part of the blade had it's original mirror-polish. As I wrote above, the blade seemed absolutely unused. No hone war at all and the edge looked like a factory edge under the microscope. With moderate polishing the rust left only some very shallow scars. You can see that on the bottom left picture.
The older the razor actually is, the less likely it will survive like this.

Second, the grind. It's an extreme hollow. Not a Solingen style double hollow but really thin and perfectly ground. I do not now when the razor manufacturers actually were able to manufacture to such standards. I don't even know if they were up to that around 1900 as Neil suggested for a possible creation date. I will try and make some close-up shots on the weekend to illustrate.

Cheers
BlueDun