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The Du Mont Royal Sovereign? That was 30". Shortly thereafter 24" and 27" rectangular CRTs were developed (in fact some Sovereigns whose 30BP4s went bad were retrofitted with a 27" rectangular CRT), but the huge sets that used them are rarely seen today. I once had a c. 1954 RCA 27" console. Scarily huge thing. Those monsters could certainly be had from the early fifties on, just check some ads and brochures of the time. 21" screens became the standard just because most folks weren't buying anything bigger.
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