The Canadian Porcelain Company was founded by Walter Goddard in 1912. Goddard devised a new cement joint configuration in an attempt to cut down on damage by cement expansion due to lightning strikes. The Goddard type cement joint was patented on July 22, 1919. Locke and CP both used this "improved" type of cement joint quite prolifically. Almost all CP multiparts made during the early 1920s seem to have been made using the Goddard patent. Ironically, the "improved" cement joint seems to have made for even greater cement expansion damage potential, at least amongst the early CP products made using it.
This example is included in that era of manufacture, and must have been CP's low-voltage distribution insulator standard during the early 1920s as they seem to have been used in a few areas. This example came from Hamilton, ON where it was found in a 1940s dump near the harbour front during sewer excavation. My guess is that it and other examples like it were out of use fairly early-on due to expansion cracking issues. This one survived in great shape in that respect for whatever reason.
Note the chunky crown - reminiscent of earlier CP styles, but with a small, crescent-shaped firing rest on the top. Many of these have a "sandy" texture where the firing rest is.
This example is unmarked. I have only seen a single M-3286 CP made using the Goddard patent that has been marked. This is highly anomalous to say the least.
The glaze on this one is standard for the era. I've seen some lighter and some darker ones, but all seem to be similar mottled reddish-orange glazes.
This style was later updated with [id=473703910;a stronger cement joint (simM-2312A)], followed by [id=473704146;a slimmer crown (M-2311)].
Thanks to Elton Gish for the info on Walter Goddard, which was taken from Multipart Porcelain Insulators, 2nd Edition. It's a phenomenal book and I recommend that anyone interested in porcelain insulators pick up a copy!