Conn late New Wonder II baritones have the X brace and later keywork style like a Conn 12M. I’m not sure that there are many differences between the two models – one bell key moves around to the right and the neck octave key changes shape a little. My personal Conn baritone is a 229k just like this one, and I think it’s hard to beat. This particular one needs a complete overhaul, but it’s not in bad shape besides the old pads. It has been played and been refinished once, but the price is a small fraction of an original lacquer 12M, so you have plenty of room to get it overhauled and still come out ahead.
