Here's an extremely rare saxophone mouthpiece. This is a Zimberoff Super Sonic "House of Note" hard rubber tenor sax mouthpiece, serial number T558.
This mouthpiece was made as a collaboration between Bobby Dukoff and Sam Zimberoff. It has a fairly open chamber with a medium facing. It blows a lot like a vintage Link tenor sax mouthpiece. It's made of excellent quality hard rubber. The piece has been professionally opened to a 7 at .100".