Thank you for viewing. This is a Denis Wick trombone mouthpiece, model 4AL. It's a large shank. Judging from the period I've had it, it's been over 20 years. The gold plating has peeled off considerably, and the rim's plating is also gone, making the feel rough on the mouth. However, it might be revived with repairs like gold plating. There are no major dents, and although it requires some work, it's a unique piece that's hard to find nowadays. Please consider using it if you'd like. Please understand that this is a used item before considering a purchase.