Thank you for viewing. This is a C.G. Conn (Conn) mouthpiece, a trombone mouthpiece from the American manufacturer, model 5CL. Judging from when I acquired it, it's been over 20 years. Due to its age, there is considerable blackening, but there are no major dents, and it can be used for playing without any problems. This is a unique piece that may not be found in modern mouthpieces. Please consider using it. Please understand that this is a used item before considering a purchase.