I’ll gonna say that “Bourdon A Etampes” is Butterfly at Etampes. Etampes is now part of metropolitan Parts.The barrel legend translates as "bumblebee stamp", I have no clue as to the "A".
My unmentionable double smoothbore hammer gun has similar back action locks - which makes for a more slender wand than a boxlock or most sidelocks.
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No proof marks, unfortunatelycheck the proof marks on the barrels
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