I think just about every mid-1960's color set I have or have seen uses that RCA CTC-15 chassis or a very similar replica: Hoffman, Wards Airline, G.E., Sears, Sylvania. I'm guessing that Motorola, Zenith, and Admiral used their own, different, designs. It appears that by 1966 or 67, more of the other name plates began to use different, newer designs.
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