This is a Yamaha trumpet YTR-6310ZS. The 6310ZS was manufactured and sold from 1994 to 2019. According to Yamaha, this instrument was made in 2009. The 6310Z had an early model from 1994-99 and a later model from 1999-2018. It has an M bore, a one-piece yellow brass bell, and an A bell, which is a slightly larger 127mm. The case is a double case with a Custom Z mark, and the scratch-prevention stickers are still attached, so it's very clean. I believe the mouthpiece receiver is gold brass. I was using it as a sub-instrument, but I'm selling it to someone as I'm organizing my equipment. The pistons move smoothly, and all the tuning slides can be removed and inserted. Please understand that there will inevitably be polishing scratches due to aging. There is a small dent on the mouthpiece receiver. Also, there was a kind of plating imperfection near where the 1st piston bell enters from when I purchased it (used), so please be aware of that. Thank you for your understanding. There is no mouthpiece, so please use your own. No claims and no returns, please.