Early Elkhart era Bach trombone mouthpiece, model 6AL large shank, silver-plated. This is a "no-dot" model from the late 1960s, identified by the absence of a dot after the "Corp" engraving, and is said to have used Mount Vernon era parts. There are scratches and tarnish due to aging, but they do not affect playability. (Please check the images) Thank you for looking.