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DaveinMaine asked me to post this for him: His analysis:

The gun is from Aime Maisonnial. S/N 12xx Best estimate is mid-20s or maybe 30s, given the Art Deco-ey carving. Barrels are Jean Breuil, 28+ inches (I'll say 71 cm - no metric ruler in my house), choked full and full, swamped rib, perfect bores and lots of meat in them. It's double-proofed at St. Etienne, with Birmingham proofs atop those. 12 ga, 2.5 inch. Strong ejectors, in time. Automatic safety. Good lockup - very solid.

I took it in to be checked out by Steve Dalzell. He really, really liked it. The cheeks of the stock showed vise marks, which Steve repaired. It came with the original horn butt plate which was really ratty. I needed about 3/8 or 1/2 inch more LOP, so Steve did an ebony butt plate to match the existing wood. There was a bit of grit in the safety, making it hard to push. That was fixed. We believe the receiver was French grey from the start - there is no sign of CCH anywhere. All the internals are finished to a high polish and numbered to the gun. Best guesstimeate is it was a bespoke gun, probably sold through Paris. May have been a pigeon gun. Made its way to England at some point, then was imported by someone in Maryland. They put it up on gunbroker.







My analysis pretty well echos Dave's:

French Markings:
. .On barrel flats:
. . . . .-- Jean Breuil – Saint-Étienne barrel maker
. . . . .-- SGDG - "Sans Garantie du Gouvernment" - patented but not guaranteed by the government.
. . . . .-- CANONIER ST. ETIENNE - Barrel maker Saint-Étienne
. . . . .-- Choke Rectifie Delalle – Barrels bored by Delalle
. . . . .-- 65 – 2 ½” chambers in mm (post 1921)

. .On barrels
. . . . .-- 18.3 – 12 Gauge
. . . . .-- Originally Double proofed in the Saint-Étienne proof house for PT powder
. . . . .-- *JB* - Jean Breuil
. . . . .-- A. MAISONNIAL – Likely Aime Maisonial. See information and video on this line:
https://doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=605133&page=1
. . . . .-- 1245 – Either Maisonial’s or Breuil's SN
. . . . .-- left barrel: Canon de Surete - Garantie - Double Epreuve = Safety barrels - guaranteed- double proofed
. . . . .-- right barrel: Crochets encastrés - xxxxxbloc-yyerence Parfait = Fitted lumps - "xxxbloc" (photo not clear) - Perfect "yyerence" (photo not clear)
. . . . .-- Marque Depose - registered trademark

Scroll back filed boxlock receiver; minimal engraving
Uses the VC "Helicegripp" system top lever
Barrels likely are the standard French 27 1/2"
Nice wood on the stock with standard French half grip.
Someone has removed the standard French sling swivels from the stock and forend.

UK Markings
. . . . .-- Reprooved in Birmingham, England between 1945-1989: (Wonder if this is a war trophy gun?)
. . . . .-- 2 ½” chambers,
. . . . .-- .729” – 12 gauge
. . . . .-- 3 tons