Retraction, maybe not a Tele-tone, I was trying to remember where I'd seen that knob layout before and it was on my Olympic!
The 7" Tele-Tone has a similar layout but obviously this isn't an Electrostatic set.
Maybe it is a reworked 630.
My Olympic has a chassis similar to an RCA type but not quite like any other set I've seen either.
The only Sams I have is an 85-10 for an Olympic TV-947, 949, 950
same knob layout but I don't know how close the chassis is.
Does your chassis look anything like this?