I think they were using up their supply of Krupp tubes on these entry-level guns as the Krupp name was becoming unpopular while our boys were battling it out with the "Hun" in the fields and forests of Europe. I don't have a 1916 or 17 Ithaca catalogue, so I don't know exactly what the company was saying.

I've seen Ansley H. Fox doubles from the late teens and early 20s with barrels roll-stamped CHROMOX on top, but still showing remnants of Krupp markings underneath!!