Well, an interesting journey for sure!
I now know more about the marque Walter than I ever did before and I still don't know much. There is information out there but the photographic coverage is not very good.
What I do know is they had a lot of names for their cars for such a limited production.
Royal, Regent,Prinz and Lord for the higher line cars and Junior, Standard, Super and Bijou for the smaller ones.
To keep the puzzle going, and you did not ask for the coach builder which I have not found anyway, my best guess at this point is a Lord from the year 1934.
If that is not correct, please unlock and give others a chance and of course, I will keep looking as well.
Edit: I changed the year..............
Bill