This is a vintage hard rubber Selmer Paris Soloist mouthpiece for the alto sax. This is one of the earlier “short shank” models, with the horseshoe chamber. It is stamped a C* and measures .075”, having been professionally opened and refaced. The piece does show some ligatures scratches around the body but no other real wear of note. A fantastic example of the one of the finest Selmer-made mouthpieces.