Just chiming in here. Catnap looks like someone did their own professional telecine of a 16mm print, which is basically confirmed by the colour bars that precede the film. I couldn't say whether its the detail level or the softness on the edges, but something about this just looks like a 16mm print to me. It would also explain a lot of the extra dirt and hairs. Sometimes television stations and airlines were provided with their own 16mm prints for showing. Maybe the print came from there originally but that's probably not the source of the telecine itself (widescreen being a major factor), my personal feeling is that this telecine came from someone doing their own transfer of their own print. I would agree that the black bars are electronically generated during telecine.

I've never seen this particular telecine before, and I think the reason this wasn't very widespread was because it's not from the commercial black market (i.e. street sellers), but done by a guy for his own viewing. The VHS copy itself looks like it is only two generations from the master, so probably he made a copy of the master for his buddy and this is how it circulated outside of his collection and online, otherwise no one but he and his friends would have ever seen it. That's my explanation anyway. My feeling is that this dates to the late 80s judging by the quality level and level of preservation of the video itself; it probably precludes the first widescreen VHS. That was probably the reason this guy did the transfer in the first place, number one it wasn't possible to buy the film at all without spending a hundred dollars or more, but number two it simply wasn't possible to see the film in widescreen on videotape, so some collector decided to use his 16mm print to make his own personal widescreen transfer.