This is the popular Yamaha Euphonium model, the 642. While it is now part of the Neo series, this model is from the series before the Neo. It's a 4-valve instrument with compensating system, making it a ready-to-play instrument, even as a personal instrument. I purchased it used from a major musical instrument store and used it for about 4 years. The pistons and tuning slides are in good working order, but there is some minor wear and tear. Regarding the plating, please check the photos. However, I stored it in a discoloration-prevention bag when in the case, so I believe there is little overall discoloration. - Type: Euphonium - Material: Brass (Silver Plated) - Number of Valves: 4 - Color: Silver - Accessories: Hard Case Thank you for looking.