I think elsewhere on VK someone proved Muntz was selling roundy color until 1973.
Zenith and RCA which combined held 80% of the TV market stopped selling roundys in 1966, but brands like Philco kept making them in 68 and later as loss leader sets to attract customers to give showrooms upsales opportunity. By 1970 I doubt there were more than 3 brands that sold a roundy. If my Sam's were complete it would be interesting to search all color sets between 1966 and 74 and see how many roundy chassis designs wer out there, who made them, and how they tapered off.
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