Dave!! Thanks very much. This is the first I've personally seen with that stamping, and the information you've provided is very helpful.
So per that article, this was made during WWII, and no known repair was made since there is no "repair date code" included. The pipe is actually in remarkable shape, once I rid it of some of the worst oxidation I've seen. Whoever bought and smoked this during the war took good care of it, never beat the rim, and was not a bit chomper; just a few small dents to heat and make right.
Thanks again, Dave!