Possibly one of the most stealthy cameras made… film advance by twisting the collar behind the lens.
That looks just like the werra III, I inherited from my Dad. Sadly both the lenses that came with it had got badly invested with fungus after he stopped using it :(
A very elegant design.
My father had a sequence of Werras, the Werramat (which I took over as my second real camera), Werra III and Werramatic. I still have the Werramatic - unfortunately lent the 'mat to someone who lost it.
"Loan oft loseth both itself and friend."
Don