A translation of Fab’s post:
Hello,
Auguste Blondeau, a weapons manufacturer in Saint-Etienne, filed several patents in the 1920s for a "HELICE" type one-piece closure.
On the right barrel of this shotgun we distinguish the initials J*B indicating the barrel maker Jean Breuil.
The pictograms found on the barrel flats are codes to designate the quality of the barrels used by the manufacturer.
The Manu used these codes to designate the quality of its "HERCULE" steel barrels.
Fab
Un grand merci pour votre patience et vos précieuses contributions sur ce site.
Sinceres salutations
Ted