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I'm sure that's a '72 model ("C" line). This is a four tube hybrid set and the last Zenith tube sets were produced in '75 ("F" line). If the date tag is missing on your set, it is easy to date the model year by the chassis number. "A" line = 1970, "B" line is '71, "C" line is '72, "D" line is '73, "E" line is '74, "F" line is '75, "G" line is '76, "H" is '77, "J" is '78, "K" is '79, and "L" is 1980. 25EC58 would be an "E" line from '74, 25KC45 is a "K" line '79 model.
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