To add to this thread, here is the penultimate post on this line investigating SN's of Robusts:
https://doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=642738

It is evident that Manufrance SN records exist and that FAB500 has access to them. It is also evident that the French, unlike the Brits, refuse to realize they can fund their archives by charging a modest fee for information. You will have to go to Saint-Etienne to get anything:

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Just to close this thread, FAB reported that the Manufrance gun SN records exist and are kept at Archives Departmentales de la Loire. He also said that it has been several years since they have responded to emails or written correspondence. FAB said to find the records you are looking for, you'll have to go to St. Etienne directly. Unlike British archives, who will do the research for you for a charge, the French apparently regard such arrangements as unseemly capitalism.

After Two emails and a snail letter, I've received absolutely nothing back from Loire Archives. I guess that's the way it is until someone changes the bureaucratic mindset there.

Baluch are not Brahui, Brahui are Baluch