There are two detail points that are worth noting about this patent:
The cable clamp bolt is at the derailleur. This is consistent with the Favorit Special, the all-plastic Favorit models that I have seen, and some Walter models, but not with the Walter in this collection.
The parallelogram pivots are held in place by distinctive ‘double cirlips’. This is different from the Favorit Special and the all-plastic Favorit models that I have seen but is consistent with all the Walter models that I have seen.