I was looking at this old LHS ad from 1946. It appears that the Purex Superfine models from that period were made from "domestic briar". It caused me to take a second look at the ones I have.
I don't recall ever seeing a stem with a threaded vulcanite tenon! Interesting !! I've collected several examples of WW2 non briar pipes. The only one I smoke is a D&P Spartan. It does tend to get a bit warm but is very light and smokes great.Here is my only example of a domestic briar Purex Superfine. No metal fittings. The threaded tennon and stinger is made of vulcanite. I'm not sure which type of mission briar this is made from, but it has a beautiful grain pattern. I mostly steer clear of the domestic briar era pipes, but they are an interesting piece of pipe history. They are usually badly grained or heavily rusticated, and are notorious for being hot smokers. This pipe is the exception to the rule.