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The pushbuttons could well be station presets, as were (and still are) used on car radios. These presets were on one side of the radio dial in the Zenith sets; the buttons on the other side were for a tone control arrangement Zenith called, IIRC, the "Radiorgan". Some Zenith tabletop sets had the presets in a horizontal row just beneath the tuning dial. I seem to remember one such radio that did have the presets in this position.
BTW, I am fairly sure the model number of the Zenith radio being discussed here is 8-S-463, not 8-5-463.
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Jeff, WB8NHV
Collecting, restoring and enjoying vintage Zenith radios since 2002
Zenith. Gone, but not forgotten.
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