When I get asked about a French O/U, it usually leads to just a few brands of guns, several versions of the Verney Carron Sagittaire, a Picard Fayolle Dactu , or a Petrek.

No clue on this one. The German connection is not something Ive seen before.

I would lean more toward pre WWII, with the double proof. The short chambers on an O/U give me that thought as well.

I cant add much more than that.

Best,
Ted