Peter - I am referring to the one piece magazine housing used during the last couple of years of production at Long Branch, not the Canadian seamless, formed magazine body. The Cdn. mags are stamped "KC". Kelvinator Canadaicon? As mentioned, no doubt started as a tube, then rolled and pressed into the trapezoidal section. As far as magazine bodies go, there are quite a variety. Seamless body; one piece, overlapped in rear groove right over left; the same, left over right; welded seam along the front; separate back piece spot welded to the u shaped front piece. Maybe others. No doubt the variations were acceptable as long as the magazines worked.