Dave, your curiosity and wise prompting has taught me at least two important things. When I was looking at these stamps all I could see, even with my glasses on (yes, lads, age is galloping up on me), was three indistinct blobs. Maybe a hint of shape in relation to the escutcheons and shield. It's actually quite mind boggling how a good, clear close-up photo can reveal so much, from what appears to be so little. And, as a result of this, I now know more about my pipe, and silver marks. So, thank you. It was and education, and, a most enjoyable and interesting evening, chasing around the interweb last night, following trails and nuggets.
As for the date letter, I keep jumping around. But, like you I doubt it's 1939, due to the stem, and info about ceasing production in '37, even though, for many reasons, I'd love it to be '39. We may never know - still, as niggling as that is, it really is of little importance - the pipe is very old, beautiful, perfect, and sure to be a lifelong companion with whom I look forward to growing old.
Troy, man, I have to concur - silver marks are a head-wrecker. I start off excited thinking I can get definitive answers from them, only to slump into uncertainty, usually oscillating between at least two possibilities. Ah! It's all part of the fun, Mate, and only adds to the enjoyment of a smoke.
Al, I know. I do. I'm grinning from ear-to-ear. It's these little gems, picked up for a song that really elevate the soul.
Thanks for all the comment, and help, Gents - I really do appreciate it very much. Still, if someone can nail that date stamp, they would certainly scratch that niggling itch for me