Thanks for the informative reply.you need a pedigree .
clearly not west German show lines
most likely pet-bred --- American based lines which going back to the
60's probably would have some German import
Troll Richterbach was such a dog that was used by domestic (American/Canadian) breeders
Here is an example Bee Jay's Jerry (AKC 10-61)
there were some really nice dogs back then .
And then things changed .
your dog looks sound , a good old sunctional structure withou exaggerations.
Happy dog . Well kept.