Re:
Both wheels have the same Rigida (made in France) rims.
I've found a couple of later Conquests on the net with the same rims so you might have a point that it's a later rather than earlier model. Although the Knight Cycles article linked in my original posts says that they got their wheels from Knight who could have been using Rigida rims from the start.
Mine is the only "three piece hanger" one I've seen other than the June '84 advert that doesn't have the rack bosses, although some of the later models with single piece hangers don't have them either, so one of my theories was that it was towards the end of the "three piece hanger" run.(The rack bosses have definitely not been removed from mine when the other mods were made, the tubes where they would go are very clean and "original") The one in the advert appears to have the gear cable going along the top of the chain stay which again was at odds with all the real world bikes I'd seen pictures of. It's clear that mine has been converted from under bottom bracket to top bracket cable runs, in a way that I wouldn't have expected a major bike manufacturer to do, so in one way solves a mystery, but at the same time I'm intrigued as to why the advert shows an "over bottom bracket cable run".
As to the Bob Jackson link, it occurred to me that his frames all appear to have serial numbers and mine has none (like early Saracen built frames).
Even if it is an Evans or other brand (and we'll never know) it would still have been made by Brain Staples mob in the "Saracen" factory so I'm totally comfortable putting a Saracen sticker along the down tube. Time to stop stressing about what/when it is and get it built so I can ride it