Patriot, the Model 400 was definitely imported by Ithaca--just that you don't see very many of them.

Mitsui picked up the importation of SKB shotguns for a fairly short period of time, right after the "divorce" with Ithaca. That would be mid to late 70's, definitely prior to 1980. Same guns as those previously imported by Ithaca, minus the "Raybar" front sight.