This is a very nice older vintage hard rubber Beechler mouthpiece for the alto sax, serial number 3122. This piece is stamped a 3 and measures .054”. It is all original and in outstanding condition. The only wear of note is some light surface scratching around the sides and on the beak, but no major wear, including no cracks, nick, or indentations. It is a quality vintage hard rubber mouthpiece.