Here's what little I know. The nomenclature is pretty consistent with the era that spanned from the early 1950s to early 1980 (the year, not the decade). To narrow it down a bit, the metal insert in the stem is consistent with earlier pipes and is unlikely to have been in use much after the 1950s due to costs. Also, the shape of the tenon is not something I've seen often and in my opinion would make it an earlier pipe. That said, I would make the guess that it dates somewhere between 1950 and 1958.
EDIT: That's a great looking pipe and a great resto job. Enjoy it!