Further......
Gerd and I may be using the same reference source, I am not sure.
I just got a book out of my cellar which shows more or less the same photo and the description is......
Klöckner-Humboldt-Deutz-Magirus Waldschlepper RS 1500. Baujahre 1946-1947.
This book is one of a series of seven that I purchased in the 1970's covering 1932-1939 and a post war edition in 1948 that are, in my opinion, pretty solid sources of information as they were published by one of the German Automobile/Truck Associations and used only factory supplied information
Sadly, in some years they are not complete as they depended on the various manufacturers to provide information, and I suppose advertising, so some marques are missing in some years.
In any case, the puzzle is well and truly solved I think.
And.....I take the point