[Arran]

 Actually the flocking behind your dial doesn't look too bad, unless it's faded and you want to redo it to make it look new again. As someone else mentioned Stromberg liked to dip their output transformers, and some others, in tar for some reason.
 Yes, test the printing on the dial glass with a moistened paper towel in a corner where it won't show, the upper left where the part number is would be a good spot. I don't know if these sets have wash away dials, I don't think so but better safe then sorry. It's been my experience that on most sets with water soluble ink or paint on the dial glass usually have the glass mounted directly to the backing plate to keep dust and crud from getting behind, and have the pointer travel in front of the glass. Then again you could sent Buzz a message and ask him about the dial glass and whether it is safe to clean, I usually use soap and water if I know that it is. The really good dials, such as many of the RCA dials, seem to have a baked on enamel similar to what old fashioned pop and beer bottles used for labels.
Regards
Arran