Evan Duke, were this a 1906 type Navy or a prototype there could be some very thin chance of your idea being correct but it is a 1916 dated Navy. In that year relationships between the Germans and Belgians were strained at best as German troops had overrun almost all of Belgium in 1914 and were still in occupation. I seriously doubt that the Germans were asking the Belgians to proof their weapons for them.
The subject pistol, like so many we see with British proofs, was in all likelihood a war trophy subsequently proofed by the Belgians as may have been required by their laws. I believe that Navy Matrosen units were heavily involved along the channel coast in Belgium.
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