Neat find!
I guess you can start puzzling out the multi-pin connector, to see if you can identify the AC power input, as well as the phone line interface. I wonder if there was a separate phone line interface box, as this unit was from the days of the Ma Bell monopoly, where nothing but approved gear could be connected to the phone network.
I think this needed internal connections to the sync and video circuits in the receiver, as well.
Not an item that is ever likely to work again without a source of scrambled content, but a very cool bit of TV history.
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