MuntzTV Roundie ad from 1969...

[electroking]

According to Muntz's biography on Wikipedia,

Muntz TV filed bankruptcy and went out of business in 1959.[25] However, Muntz's success continued in the sale of cars and general consumer electronics.

This would suggest that there is very little 'Muntz engineering' in this 1969 TV. Maybe
he put his name on some generic set that was being sold elsewhere under one or
more different names.

The article also discusses a 4-track automobile stereo system he developed
and marketed with some success before the 8-track format took over (for just
a few years as we all know).