[Arran]

No, the bar on paper caps indicates which end is connected to the outer foil on the inside of the capacitor. There used to be a theory that by connecting the outer foil  to a point electrically closer to ground, that it would be useful for shielding in something like a coupling cap. You may have noticed that modern non polarized caps do not have this marking on them, and the reason being is that they decided that it just did not matter. I don't think that they really paid much attention even when sets like this 41-295 were built as I have found them connected with the line pointed every which way, and yet these sets all mostly worked fin when they were new. On the other hand it's nice to have a set that has all of the original paper caps still in it, as you can melt out the guts and restuff them to keep the set looking more original underneath, as opposed to having bright yellow film caps everywhere.
Regards
Arran