I wonder if the Canadian models were, in fact, Hotpoints.... When I was a brat, my family had a 1978 GE convertible that had a porcelain on steel tub, BUT I remember acquaintances who had slightly fancier GE built-ins of the same vintage with porcelain on steel tubs, too. My first house, which I bought in 1989, had a brand-new, one-down-from-the-TOL GE Potscrubber II - it also had the porcelain tub, but may have been one of the last!