Hi,
Following up Jim's post, I think it is important to remember that during the 18th century there really was no Germany as we know it today. It was still a collection of relatively independent states and principalities, many of whom strongly adopted French culture, language, art, and fashions. For example, during mid century, Frederick the Great of Prussia was a close friend of Voltaire and he was infatuated with French culture. Despite warring with France, he still adopted much that was French. Among the well-to-do in Europe, his example was not unique. I am sure that influence affected the artistic styles of firearms throughout much of Europe such that French styles were often blended with other regional traditions.
dave