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1951. Zenith had their last year of the porthole the same year. That set is a little odd in that Zenith actually used 1950 escutcheons behind both the larger knobs. The channel numbers were on a rotating drum, and viewed through a small window above the knob, not a round dial behind it. Zenith would likely stamp the model of the set in black ink. Look on the back of the cabinet, somewhere along the top edge.
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