Keep in mind that there can be several different Photofact editions for a very popular model, as it receives slight changes over its production life (in TV's, the RCA CTC-38, for example, is one example of an enduring popular model that has received upgrades to the circuitry through its production life and therefore had several Photofacts numbers on it.) I can try checking my photofact index and see what the earliest date is for the Zenith.
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