LASKEY Euphonium mouthpiece "57E". I think it can also be used for trombone. This is a handmade mouthpiece by Scott Laskey, an American mouthpiece maker. It's a rare gold-plated model. (I am the second owner, so I don't know if it was plated by the manufacturer or re-plated.) Plating: Gold Cup Inner Diameter: 25.7 Cup Depth: deep (Euph Cup) Throat Diameter: 7.14 Shank: Large shank ※Equivalent to Bach 4G I think there are no other damages except for shank marks, but please consider this with the understanding that it has been used.