Vintage Conn Comet tenor mouthpiece in a #3 facing. These were the mouthpieces that were included with the Conn “Constellation” saxophones. This mouthpiece was made by Santy Runyon for Conn.
This one looks like someone has carved out the chamber since this should have been a higher baffle mouthpiece originally.
Original Ligature and Cap included! You don’t see these too often.