Charles Bay alto saxophone ligature (Selmer size) for American-made saxophones. A Meyer mouthpiece might fit, depending on the reed thickness. The case is from the original era. Today, the silver Bay ligatures are thin brass with rhodium plating, but this one is nickel silver (German silver) with silver plating. The screws are unplated. Compared to brass, it gives a slightly brighter tone with more overtones. There is some discoloration of the plating, so it is listed as having dirt and scratches, but there are no scratches or distortions that would affect its use. Thank you!