Sure it's Belgian? SGDG* is a French requirement; I am not sure if it had to be used on imported guns as well as those made in France. Belgian proof marks (the E L G in an oval) would prove Belgian origin.
* It means, in translation, "Without a guarantee by the government". Sort of a disavowal of the idea that granting a patent made the government responsible for the proper working of an object.
Jim
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