[Arran]

From what I can recall the code on molded mica capacitors (no silver in these usually) is read like the resistor code, so the colours you are seeing are either red or purple, so on the Aerovox cap the code would be 4-4-7 or 4-4-2, so it's either 440,000,000 pf/mmf (not likely as that would be 440 mf) or 4400 pf/mmf, or the third dot is the third significant digit rather then a multiplier. Are there any markings on the other side of either mica cap, like a paint dot?
Regards
Arran