I happen to have a couple of exceptionally nice Bundy Altos in stock.
They are very similar horns.
The older one has lacquered brass keywork, the G# fingertouch is offcenter above the other touches in the cluster, the nonremoveable keyguard is different and the engraving is lovely.
The more modern one has nickle-plated keywork, G# fingertouch centered above the cluster, different keyguard (removeable) and a simple engraving. Eventually the engraving disappeared from the Bundy and was replaced with a decal.
The neck of the older one is slightly longer, with the octave vent a little further from the tenon. Part of the additional length of the older one comes from its having a ferrule.
Perhaps one of the most regrettable things about the horn is the name. “Bundy” reminds me of a school marm. Too bad George Bundy wasn’t named Max Wunderhorn, or something like that….