Antione Bertrand was a very active maker from all the evidence. He was active 1886-1900, perhaps earlier. He was involved with Riga at some point. He had 2 patents and a whopping 38 trade marks / names registered. Names like The Terrific, The Destroyer, The Zulu, The Hunter, The Bushman, The Murderer, The Protector, The Defender, The Bold, The Revenger, The Wakeful, The Western boy, The Strong....
There were various Bertrands active until at least the 1930's.
I have a Joseph Bertrand catalog, circa 1912. Your gun sounds like a cape gun.
Pete
