A while back I acquired a fat-handle Canadian Tech that has the "1932" inscription (it describes year of patent but the razor was available in the early 50's). I didn't use it because it appeared like your common fat handle Tech. Last night I decided to try it with a Personna Lab and was taken aback from it's aggressiveness and performance. Usually, the triangular-slot flat-bottom plate fat-tech (that's a mouth full) gets the distinction of the most aggressive Tech but I don't know if it was me but it was a different feel. I've used the tech/feather dozens or even 100's of times and this felt a little different.
Below, I will show you the bottom plate of ball end, S.American aluminum, triangular, and the Canadian Tech as comparison. The final pics show the similarity of the ball-end's bottom plate and 1932 plate but the last pic shows how different the blade gap appears. Weird.