Our highest UHF was 68. IIRC it started as a pay TV as was
ch 27 out of Worcester ( Zenith system) for a while.
IIRC there was an airborn UHF in the Ohio area in the 60's
that may have used channels above 69.
Missed the TV in TV & I agree its a Maggy. I dont remember
the style so was is an industrial model ??? Looks abt 1960 vintage.
73 Zeno