Hello! I am listing my Conn Alto Valve Trombone for sale. From what I have been able to find, it is a mid- to late-1800s model. Different build than any images I have been able to find. I had it partially refurbished (make it playable and pretty) around 2023; the pictures I have attached are post-refurbishment. It plays, and is one of the quirkiest instruments I have come across. It will come with the pictured mouthpiece. I have no idea about measurements; unfortunately, the only information I have is what is stamped into the horn. I will entertain any reasonable offers, as there is no way to gauge how much something like this is worth. Own a piece of C.G. Conn history!

Nice! I have a later one that's quite a bit different.