In looking closer at the rifled tube insert, I found some stamped lettering at the breech end. There's a line that looks like it says "Brown &" and then there's more, but it is covered by some rust. It could probably be uncovered, but I didn't want to risk damaging it.
There's also another line that's half worn and rusted, but it may say "ENTERPRISES". It's smaller text, though.
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