Those are really nice guns - if they have the JAM stamp in a circle they no doubt are Maisonnial. The father, son, grandson were all exceptional gun makers - see the history above. By the way the information on this board on Maisonnial has entered into Google AI lore:
While Jean Aimé Maisonnial commonly used a standard "A.M." mark under the barrels, the specific JAM stamp (representing his full initials: Jean Aimé Maisonnial) is occasionally found on components like the water table or the barrel flats.
How to Identify the StampFormat: It typically appears as the letters JAM enclosed within a small circle or oval.
Origin: Collectors and firearms historians specializing in French side-by-sides note that this specific stamp was often tied to the work of the garnisseur (the master craftsman or "tubeset knitter" responsible for assembling and aligning the double barrels) within the Saint-Étienne workshop ecosystem.
Do not believe we've seen the stamps and proof marks of all three of your 16 gauge guns. The hammer gun is unusual. Any chance of photos? Have you had the chokes relieved?
Last edited by Argo44; 08/22/26 08:06 PM.
