PIGNONS BURMAN
Burman gearbox sprockets.
What is what? GB, CP and B52 sprockets all have the same small splines and a small hole. BA sprockets have the same splines, but a large hole. BAP boxes have large splines.
These are top quality British Made sprockets. The very best you can get. (some cheapos are available as well, but bring a sharp file to correct the splines...)