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The sets you are studying, like all later sets, were equi-band. That is the one thing you can state clearly. The overall chroma frequency response was less sharply defined as the circuits were simplified, so whether you call them wideband or narrowband is simply a matter of definition. Bandwidth is often stated as the 3 dB point. In later sets, some color modulation is usually visible beyond 0.5 MHz, but it is full of quadrature distortion and for that reason hopefully low level so it doesn't mess up color edges. One way of judging this is the transition between the green and magenta color bars. This may be smeared and look dark, but ideally goes through a neutral point and doesn't look like any particular strong wrong color at the edge.
So, rather than calling these sets wideband, I would call them sloppy band.
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