From the French gun terminology line: http://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=480959

Brevet(e) - patented
...Brevet(e) SGDG - model patent ("sans garantie du gouvernement")- Patented Without Guarentee of the Government". French distinction that designates a technical patent in the U.S. sense, as opposed to trademark and the old design patent number system that dealt only with name and shape.

Somehow doesn't look like a pre-WWII Manufrance. I could be wrong. What's it chambered for?

Baluch are not Brahui, Brahui are Baluch