The stamp on the upper (left) barrel is
[Linked Image from i.imgur.com]
-- "Depose" - "Registered trademark"
-- "Acier Comprime" - "Compressed Steel" - identical to Whitworth's name for his steel in England patent ran from 1865-1879 - maybe a couple of years added.

That stamp is identical to this one:
[Linked Image from jpgbox.com]

It was often used by Saint Etienne barrel maker Ronchard Cizeron. It may have been used by others in the late 19th - 1st 30 years of the 20th century as well since it appears quite often.
Here's an example....not the "6.5" (pre-1912)
[Linked Image from i.imgur.com]

Last edited by Argo44; 02/26/23 04:53 PM.
Baluch are not Brahui, Brahui are Baluch