RARE Gustav Langenus Hard Rubber 'Duckbill' Bb Clarinet Mouthpiece

RARE original Gustave Langenus hard rubber mouthpiece for the Bb clarinet. Langenus famously designed his mouthpieces with a duckbill beak, and that is evident here. It could use a good cleaning/scrubbing on the inside, but is in very good physical condition, with no teeth wear on the beak and the tip and rails are in superb shape. The facing is original with tip measuring .042” (1.06mm). A very neat mouthpiece for collectors especially, don't see these come up for sale very often.