This is a fantastic example of a vintage New York "Tone Master" Alto mouthpiece. The mouthpiece is completely original, and looks great. It has a 3 facing, and a serial number of E20. This piece has a pretty dark sound, and a lot of pop. A lot of metal Alto mouthpieces can be a little to much, in terms of brightness and edge, but this piece has a nice balance that is hard to find in metal Alto pieces.