After several email exchanges with JodyJazz company giving me bits of advice and hints to find out a mouthpiece that suits me on my Conn 10M, I've finally chosen the Custom Dark.
The reason is simple: the sound is terrific! It is a masterpiece, easy blowing, nice and dark sound without projection compromise. At last, this mouthpiece allows me to be in tune with my vintage saxophone. If you are a Conn 10M player and experience intonation problems with small chamber or modern mouthpieces, don't miss this out. The custom dark is the solution!