Vintage Kay O'Brien 4 Crystal Clarinet Mouthpiece .1.04mm/.041”

This is a nice vintage Kay O'Brein crystal mouthpiece for Bb clarinet. The tip opening of the piece measures 1.04mm. Its beak and outer body is in very good physical condition. The facing profile is in very good condition but does have a couple of notable points of cosmetic wear along one of the lower rails and outside of the tip rail. 

 

This piece plays with a focused response and a brighter sonic color.