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I'm working on an Olympic now, model unknown but the chassis looks the same.
The switch on the back is a Local/Fringe selector.
Are you sure that's an RCA connector? Mine has a hole on the side but it's just the other end of the Horizontal Frequency coil, a lot of RCA's have it too.
I think this is a modified (Muntzed?) version of an RCA 721, I have a Tele-Tone that has a very similar chassis but the knobs on the front are laid out in the RCA style of straight up and down.
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