Roundie to identify

[Electronic M]

Originally Posted by WISCOJIM

In a British set?

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Yes, the Britts and a number of other countries bought American color CRTs for experimental sets when developing and testing standards.

Think about it, why set up a the expensive equipment for color CRT manufacture when a standard has yet to be established? The BBC did not officially have color broadcasting until 1967 (when that tube would have been sorely antiquated).