Well, I'd say you got quite lucky there, man.
From where I'm lookin' I'd say it was made by Comoy's,as what's known as a "seconds" under the hardly ever seen BB moniker and it emulates the highly sought-after Dunhill LB shape, so it's a winner indeed! Looks to be in mighty fine condition too! Hope itsa helluva good smoker for you!
Look at the 2nd photo down here on this page:
http://www.glpease.com/Pipes/Collection/comoy.html
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...if that don't clinch it,
then this most certainly will:
From the Loring pages, exact same numbering stamp 342B !!!
I could be wrong though, I ain't no expert and this is all pure speculation on my part,
but it looks like it's a Comoy's 2nd to me.
But regardless, you gotta damn good deal if this is the pipe ya got:
VINTAGE B.B. BEST BRIAR SUPERIOR SMOKE PIPE - LONDON ENGLAND - NICE
Happy days & Holy smokes!