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Stamped into the chassis is 2412297, which I assume is the serial number. Printed on the large speaker is, Zenith and 49CZ883 and 343320. That's all I could find in the radio that wasn't just a part number. Nothing on the tubes, which are all Zenith except for one GE, to indicate a year. So from what you said, Tom, I would assume that the 343 is the speaker manufacturer and the 320 is the year 1953 or 1963 and week 20.
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