This is a very cool vintage hard rubber Bobby Dukoff “fluted chamber” tenor sax mouthpiece. This piece is stamped a 7* and measures true at .105”. The facing does appear to be original on this mouthpiece. Physically the mouthpiece shows some very minor cosmetic nicks and scratches but no serious wear. You won't see that unique chamber design on any other mouthpiece! A great old piece that plays with a warm sound similar to a Link, but with a good amount of bite too.