Brancher Mpces.

I got the following information from the internet.
It is not my own first-hand experience.

I think these are very good mouthpieces. Mouthpiece Heaven (Theo W) seems to think the same; when he put a bunch of pieces on eBay recently he described a Brancher (baritone) piece as "the best current production mouthpiece".
I believe they are made by a provincial musician in France called Pascal (??) Brancher. First of all there were Brancher straps and ligs, then the mouthpieces (and reeds) appeared. They were (are?) distributed by Frank Bichon.
The model names are quite logical. The letter tells you what kind of chamber or baffle, and the figures are the tip opening (in tenths of a millimetre). Therefore a J20 is a "Jazz" chamber with a 2mm tip opening.

The various designs are:

In metal:
B -- the brightest; high step baffle, small chamber
E -- less bright, still a modern sound concept
J -- described by Brancher as "round and centred for all styles of jazz" -- still quite bright, edgier than a Link I'd have thought.

In ebonite or ebony (wood):
L -- large chamber
C -- classical style


For sop he makes E, J and L
For alto B, E, J, L and C
For tenor B, J, an "LJ" (= "large jazz") and L
For baritone LB (metal) or L (rubber or wood)

Tip openings available are:
sop -- 15,17,21 (=60 to 85 thousandths of an inch approx)
alto -- 16 to 25 (= 60 to 100 thousandths)
tenor -- 25 to 31 (= 100 to 125)
baritone -- 27 to 31 (=105 to 125)
This suggests there is quite a range of options. However I think they are generally all on the bright side of the spectrum. I have and play hard rubber L pieces for sop, alto and baritone. My alto L23 is quite a bit brighter (edgier, harsher??? take your pick) than a Berg 115/1 I have; and a lot brighter than a Meyer. However the sound remains reasonably fat and there is a nice vibrancy or "ring" to the sound in the upper register. As the L chambers are supposed to be the least bright of the range (apart from the classical model he offers for alto) this suggests to me the metal pieces (which I haven't tried) must be pretty brash. In fact a tech I know (enthusiastically) described some early examples he had as having "an OUTRAGEOUS sound".

Everyone agrees they are accurately made and well-finished. Whoever he is, Brancher is a fine craftsman, and it seems he has quite a distinctive sound concept. Whether that concept will coincide with what players are looking for is another question. I think they're worth checking out.