古董 1976年 O'Brien 4 水晶 Bb 單簧管吹嘴

Vintage O'Brien Bb clarinet mouthpiece. This one is stamped 4 and 76 on the table. The table, tip and rails are in great shape overall. I see a very small blemish on the tip, but it's quite minor. The facing is original and the tip opening measures .042".