Here is an original 1960's Brilhart "Hard Rubber" model alto piece. This mouthpiece measures .070" on my gauge.
This is a 6 digit era Brilhart in excellent shape. These are also sleeper designs for alto. These feature nicely undercut sidewalls that open into a medium to medium large chamber. It is almost like a cross between a Meyer NY USA and a Slant "Tone Edge".
If you are looking for a larger chamber than a Meyer but feel like an Otto Link is a little too spread, this is an ideal choice. Made with some of the best rubber produced.