This is a great vintage Brilhart Personaline model mouthpiece for the alto sax, serial number 90686. This piece dates to the Carlsbad days, and is of the Hard Rubber series. It is in tremendous original condition, stamped an L4 and measuring about .065”. The mouthpiece shows no wear of note and only light oxidation of its hard rubber content. It has a factory-like look to it and is in pristine shape.