Selmer Air Flow M20 Alto Saxophone Mouthpiece

Selmer air flow M20 alto saxophone mouthpiece, s/n 2155. This mouthpiece is in very good condition overall. The table, tip and rails are also in very good condition considering the age of the mouthpiece. There is a slight flaw on the left rail, but it's minor. There is a chip on the edge of the shank, but the original metal band prevents any damage from getting closer to the table. The facing appears to be original and the tip opening measures .061".

This is a rare USA made Selmer mouthpiece. I have a similar air flow alto mouthpiece made in France. Unlike the other one, this has rounded side walls. It also has a small chamber.