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Don't hold me to this, but...
I think Hoffman, RCA and Zenith were experimenting with rectangular color CRT'S at that time. I believe the eatly rectangular prototypes used metal shells. As far as convergence goes, I have almost always had a much harder time getting it as close to perfect as possible with rectangulars than with the rounds.
I have seen ads as early as 65 (possibly for the 66 models) for rectangular color from RCA and Motorola.
As far as pics of my sets go, I think I may have had a brainstorm (a rarity for me...LOL). As soon as I get back north and I can try my idea, I'll let you know and post the pics. The RCA will not be included since it is disassembled and I have not selected a cabinet for it yet. Look for the Zenith, Silvertone and Sylvania first.
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