.25 inch by an eighth would not be a 50000pf back in that era. They might be 25 to 100 pf or somewhere in the low PF range.

Do you have a DMM with a capacitor tester? they are not all that arrurate, but will put you in the ballpark of the actual value..

If you have a bunch of caps to test , you can buy a cheap cap tester for $12 or so on Ebay..

Once you get the real value , you might be able to reverse engineer the color code lost to time.