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I think that Zenith is a varactor tuned CCII metal cabinet table model. I believe varactor tuning was introduced in Zenith's product line around 1972 (I have a D line varactor tuned set). That set appears to be later than 1972 (since it is similar, but slightly different than my D line's tuner), but is probably older than 1976 (since my 1976 varactor tuned set has a tuning knob with a single channel window).
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