As a point of reference, from my Reilly database- SN 10655, under-lever Lefaucheux style break-action shot gun with detachable fore-arm. SN would date it to March 1858. (See the Reilly line - sorry, it's the only database I have):
https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=436538&page=36



Baluch are not Brahui, Brahui are Baluch