VINTAGE M.C. GREGORY 4A 20 BOCCAGLIO PER SASSOFONO CONTRALTO - LOGO LOS ANGELES DIAMOND
It is a Los Angeles era 'diamond logo' Gregory with the serial number 15731. This mouthpiece is made of a resin material. It is stamped 4A on one side, and 20 on the other. This mouthpiece is in excellent used condition.