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These are two different phenomena. The dark edges in the 1984 set are the result of video processing to improve sharpness, and are deliberate.
The effects in the earlier set indicate some sort of problem, like improper fine tuning or IF misalignment, or maybe AGC adjustment. Note that the dark edges are combined with greatly increased chroma level, which would indicate the chroma transients are also being enhanced. I think this indicates the set is tuned too high in frequency (or the IF is tilted) putting the video carrier at too low an amplitude.
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