Just noticed that the same screenshot image from the ETF is not as badly overexposed, unless "it was fixed".
So now we have to consider the sources of the two different exposures in these two photographs and we should actually see the original photograph in its pristine condition to make a definitive judgement as to whether the screenshot is real or fake. I don't see a motive to fake the photo in question way back in 1953-54.
http://www.visions4.net/journal/wp-c...image-157.jpeg
This is the camera that broadcast the closed circuit color images of the 1953 coronation.
http://www.visions4.net/journal/wp-c...image-155.jpeg
.... Which looks very similar to the image of the camera published in the book shown on the ETF website.
http://www.visions4.net/journal/wp-c...image-156.jpeg
How do we know the two images in the book weren't taken at the same time for the publication?