"Non pour la balle" isn't often seen on French guns, except very old (pre-20th century?) ones.
Raimey, according to Kennett, the only crossed palms mark that was no longer valid after 1924 was the old triple black powder proof, which showed 4 of them on each barrel. Double and triple are still valid, double (2 marks) being a black powder proof at 16,500 psi and triple (now 3 marks rather than the old 4) 18,000 psi. Two crowns over PT is slightly different: superior definitive proof with powder T, which is smokeless. From the proofmarks, that gun has a double black powder proof, but just the normal definitive proof with T powder.
Tim's second post confirms (as was almost certain) that Ronchard Cizeron was a St. Etienne maker. Looks like they made guns for various retailers, in this case a gunshop in Montargis.
