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I think it boils down to the fact that RCA just sold more than anyone else.
Zenith didn't even sell a color set until 1962, RCA basically invented them.
RCA had several firsts, The 630 621 were 1946 sets so they are as old as you can go in post war collecting, the CT-100 was the first Color set and is a legend, not to mention scarce.
There are other early color sets far more rare than the CT-100 but there are so few of them they don't get much attention.
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