This is a satin silver and inner pink gold SCHILKE SYMPHONY D5.2 mouthpiece for euphonium and large-bore trombone, made by the American instrument maker SCHILKE. Rim Inner Diameter: 25.78mm Cup Depth: Medium Deep The item for sale is from the initial production run (with two rings on the constriction), and is believed to have been made by Mr. Hammond at the Silky company. The Symphony series is famous for being designed by Mr. Hammond, who later became independent and established Hammond Design. I haven't compared it to the current model, so I'm not sure, but it's very easy to play and gives a warm sound. The satin silver has a mixed appearance with the regular silver, as if there are scratches, but there are no particular problems. There are also scratches on the shank due to use. I was using this mainly for euphonium until recently, but I'm selling it because I found a mouthpiece I liked better. Feel free to ask any questions in the comments.