@jdlmodelt I have a similar American Standard. It didn't seem like a particularly good horn (valves were pretty ordinary) and so I conducted some surgery and turned it into a C horn as a fun experiment. FWIW, it sounds ok and plays pretty much in tune, and the valves are still ordinary. It's waiting for me in the workshop to get enthused enough to tidy up the soldered joints and finish it.
If yours makes you happy keep it, if you want to flip it, check pricing on ebay.
cheers
tj