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Looks like "knob fungus" some plastics like to form it. It's harmless electrically, and on some plastics it can be cleaned safely with a soak in windex (some plastics are harmed by it though)...Don't soak the coils.
Yoke cover plastic of the 50's and early 60's has a tendency to become brittle and disintegrate so be careful with it, and be wary that this could be a manifestation of the beginnings of that.
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