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Is the width on that set set so it includes a fair amount of the video image? As the porthole is round, and NTSC video images are rectangular, it would make sense to squeeze a bit the width so you don't crop too much of the action. It does make for skinny faces and actors though. 75% squash on the width would make it a square picture, and given that you'd want some overscan on the vertical (to avoid seeing vertical interval trash) you'd see about 75% times overscan width.
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