I think $100 would be top dollar for that set and I doubt there are many people on this Forum who would give that for it.
The missing knob and tube are minor issues, (I may have the knob) easily replaced, but if the CRT is bad you basically have a $10 parts set because it's often difficult to find a good CRT and more expensive than the set's value.
Not trying to be mean about it but the fact is you can often find a nice mid 50's set needing little more than a recap for less than $100, if major parts are bad then it becomes a labor of love to save one, though many of us have done just that.
I gave $60 for this Philco just to keep it out of the hands of the "Re-Purposers" a.k.a many other names around here) the fact that it was in fabulous condition didn't hurt any either.