Shape of Canadian or Lovat

I am always confused about the pipe shapes of Canadian, Lumberman, Liverpool and Lovat. As described by Pipedia https://pipedia.org/wiki/File:Lpool.gif , these two pipes are
"#A" Canadian as the stem is oval and the stem is tapered. "B" is Lovat because the stem is round and the bowl is saddle-shaped.

Meanwhile, the "#A" is a Regd. Crown "S" era with a Jo Larsen stamp, is it a special stamp made by Jo Larsen own hand or just designed by him in the late 60's to 70's?

And the "#B" is a Regd. "S" era made in 60's?