Here were my observations via PM.
"
Acier Comprime" - compressed steel....means nothing an advertisement
"
COA Canons" - this will be the barrel maker. I cannot identify "COA" as yet (if the letters are correct - they are stylized). I thought it might be a mark for Saint-Etienne barrel maker (Cannoniere) Chavot Armuriere - founded in 1924 by Jean Chavot - fourth generation still at it. I might write to try to confirm or will continue to search the internet.
"
Choke" (word indistinct)" with "
SMR" in the semi-circle. Usually the word "choke" is associated with "rectifie" which means nothing. The initials though will mean something. I'll search more. Need to confirm they are "SMR".
There is an inscription "
Medaille d'or" (Gold Medal) on the barrel...obviously a prize won by the barrel maker at some world's fair. We should be able to turn this up.
The gun is advertised as having 2 3/4" chambers. If so they are lengthened. They originally are 65mm (2 1/2"). Chamber length in MM so after June 1912.
"17.4" = `16 bore
Proofed for PT powder (smokeless nitro - post 1900).
It is double proofed in Saint-Etienne.
"Fusil Fabrique a Saint-Etienne" - Gun made in Saint-Etienne
"Avec Bascule importe d'Allegmangne" - With Action imported from Germany
Can't help with the cocking rods unfortunately...not familiar enough with O/U. Again Raimey or Ted or wild cattle or Larry might recognize something.
It's got that little half pistol grip stock which is Saint-Etienne. The butt plate is very French.
The interesting thing for me is "
Allemangne". It's not "Ouest Allemangne" (West Germany) or FRG (created in 1949)...it's just "Germany." so Post 1991? It looks a lot older than that. It may be just after WWII...and occupied Germany was still just "Germany." There was a Lyon regional country-side pursuits fair in 1949. Wonder if the Gold Medal came from there? Or it could be even earlier....1930's?
