It simply says British Briar / Made in London - England. While there are various legends about this stamp, none of them are definitive, so I won't share them in the description.

 Root Quality

 Too bad
 Bad ✅
 Good
 Very good
 Perfect

 Smoke Path (Air Hole): Wiping to the bottom of the chamber and right in the middle. While I wouldn't call it perfect, it's a pretty good smoke path.

 Shank: Clean. No tar or soot, well cleaned.

 Chamber Cleaning: Quite successful. The track was etched quite successfully. Smooth and symmetrical.

 Defects: 12 pits (sand pits) including the chamber wall and shank.

 Score: 5/10

 Comment: I can ignore a few well-camouflaged pits in estate pipes, but because the number of pits is so high, I marked the stem quality as "poor." Does it affect smoking? Absolutely not. Pits only in the bowl can have a slight negative impact on smoking, but pits on the bowl wall and shank have no such effect. The cut, symmetry, airflow—in short, the workmanship—is quite good.

 Note: Any pipe that hasn't created a track (cake layer) will heat up unless you use a very, very slow, systematic pace. Heat-up is not a criterion for pipes without track.