[Arran]

It has more to do with the styling of some Ingraham made cabinets then the name, at the same time Ingraham also made some Emerson cabinets that were only mildly more interesting then a packing crate. Before Mark Steins books came out nobody talked about Emerson aside from their Catalin models, and nobody talked about Ingraham either. Ingraham was a cheap clock company that made cabinets for a cheap radio company basically, you won't find an Emerson equivalent of that 38-116 of yours for example. As for a brand Z Walton set, well there was the TV show that featured one as a prop but I suspect the styling combined with the shutter dial also had a lot to do with it.
Regards
Arran