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green stripe test signal
If my cloudy memory serves me correct, networks would transmit a narrow green stripe down the side of the video during daytime B&W shows for servicemen.
As there were very few daytime color shows and most sets were delivered and installed during the day, the stripe was transmitted several times a day so installers could see if the set was picking up the color signal.
Not sure if all the networks did this, but NBC would be a likely choice to help RCA sales.
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