For what it's worth, there used to be a small Canadian electronics manufacturer (in London, ON as I recall) called Spartan that made re-badged sets for other companies as well as TV's and radios under their own name.
I recall way (way) back while working as an apprentice in a local TV repair shop (before I graduated in electronics
) I worked on a very smart Spartan portable TV - around 1961 or 62. It was a vertical chassis set with a transformer-less power supply.
I recall working on quite a few Spartan's - well, do you think it was because I lived in London ON (duh).
Paul