This is an old CONN tenor trombone I purchased on Mercari. It uses a small shank mouthpiece. There is an engraving on the bell, but I couldn't find a model number. The model number is unknown. The bell diameter is 190mm, approximately 7.5 inches. The slide is quite clean and I believe it's nickel silver. I couldn't find any model numbers or serial numbers. The joint between the bell and the slide is shallow, and it loosens if not tightened firmly. The slide is in good condition compared to the bell, so it feels like it might be a different slide than the original. The slide action and the movement of the tuning slide are smooth. Sometimes the slide lock catches. I tried playing it once, and it has a light, mellow tone. Due to the condition, please understand that this is a 3N item (no claims, no returns, no cancellations).