Here’s a very nice vintage hard rubber MC Gregory “Model A” mouthpiece for the alto sax, serial number 6389. This piece is a 4A 16 small chamber piece, and measures .062”. It is completely original. This piece is in incredible shape, nothing more than very light surface scratches here and there. No cracks, nicks, or major scratches. A very nice mouthpiece, plays with the classic “west coast” sound.