Here is an alto trombone you won’t find that often. A Yamaha Custom YSL-871. The Yamaha Custom line was established well before the Xeno line, and this is not one of the Xeno models. This one must have been made in the 1970’s or 1980’s.
There is a scar on the bell from a removed dent, but other than that it is in pretty great condition. This is one of the easiest playing alto trombones I have ever played!