Back around 1970/72 a co-worker showed me an Ithaca Flues 20ga he had inherited from an uncle. His uncle had bought it new & it carried the Ithaca name on one side of frame & a hardware chain on the opposite side. At this poimt I am not certain of the hardware name, but seem to recall it had a ST Louis address. Also I don't recall which side each name was on.
Also while it retained the right forward & left rear trigger positions they were slanted for left hand use which my co-worker said his uncle had ordered them that way, he being left handed.
As I recall it dated in the 1920s.