[Arran]

 It is also possible that it may have been a home brew set of some kind, if you look in the old magazines you could buy everything used in this set through many of the popular mail order catalogs of the time, I have also seen ads for companies that sold generic cabinets that one could drill and cut to fit the chassis of one's choice. The chassis looks almost home made to me, like whomever made it didn't have a proper sheet metal brake, and the notch for the speaker looks like someone cut it with tin snips. The speaker is a Quam, I recognize that rear bracket anywhere, the tubes are metal-glass types, rather unusual, I think that Sears Silvertone brand sets were the only notable brand to use them. The tube sockets used a snap ring to hold them in place, they may be Amphenol sockets, very few manufacturers did things that way.
Regards
Arran