[Arran]

There is a code that most companies used to denote a molded mica from a molded paper cap, I think maybe Aerovox and Micamold were the two main manufacturers of molded paper caps. If I am not mistaken Philco used either their own in house capacitors or Sprague brand so the chances of a molded paper cap in there are pretty remote unless someone added it, Philco models, especially post war sets, had very detailed parts lists describing the sizes and types of parts used and I can't recall seeing a molded paper type used in any of them. Molded paper caps are usaully quite large and I don't think that they made them in sizes smaller then a .001. Leave it alone unless it's obvious that you have a problem.
Regards
Arran