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I'm pretty sure if it is one of those knobs in the picture it would be one of the ones in the back two rows where the channel number shines through the center. The circular ones where the channel number shines through the top were used by Zenith in 59/60. Zenith used the three-pronged ones in 61, on non-space command sets. The others, where the number shines through the center, are 1963-66 knobs. But on the 61-62 space command sets, they used a knob that I don't have a spare of, where the number also shines through the center (but you can see one on my set in my thread "62 Zenith 19" SC300" in this forum) - your set might use one of those.
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