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I once had a little 14" Sears 'flat' table model with a tuning system I never seen before or since. It had 3 concentric shafts, the outermost one for hi-lo bandswitch, the middle one drove a pointer, and the innermost one was continuous-tuning.
The bandswitch knob was big, about 3" in diameter. It turned 180 degrees to select hi or lo band. Half its face was calibrated in channels 2 - 6, and the other half in channels 7 - 13.
The pointer (on the middle shaft) was direct coupled to a 'radio-style' tuning cap gang, and pointed to the selected channel.
The continuous-tuning knob (on the innermost shaft) drove the capacitor gang and was verniered about 3:1.
IIRC, the tubes were 6J6 and 6CB6.
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