mawp, that 19 is very impressive! The "Regd. No." stamping discontinued in late 1960s to very early 1970s, I would say your pipe is from that period. You can see a different shape 19 in the "late '50's" catalog here,
https://pipedia.org/images/6/64/Stanwell2.pdf
Have a look through the 1970 catalog here,
http://files.homepagemodules.de/b169807/f122t2530p9256n1.pdf
:D
https://pipedia.org/images/6/64/Stanwell2.pdf
Have a look through the 1970 catalog here,
http://files.homepagemodules.de/b169807/f122t2530p9256n1.pdf
:D