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I've heard two different reasons for the socket.
One was so that the B&W set would be able to receive the incompatible CBS sequential Color broadcasts (that never happened).
The other reason was that it was for an external color wheel system so a B&W set could be converted to color.
Which is correct? I don't know, but most of the sets with a socket seem to have been made around 1951, or just before the CBS system was set to launch.
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