Kevin,
I didn't see any mark that would ID the actual maker, but did notice the barrels(at least the shot barrels)seem to have been made by Schilling Forge.Since they supplied multiple makers, this isn't much help.It was made between 1893 and 1912, and in my experience, the bore diameter shown as 118.35ga, usually goes with a groove diameter of around .358-.359", which makes finding bullets easy.
Mike