Hi John,
I don't understand this statement:
"The original color of the receiver is about 70% with some color still visable."
If the original color is 70%, what does some color still visible mean?
In any event, definitely do not restore it. It will cost you a bundle, as the others said, and will be worth less than it'e worth now. Especially is it has 70% color as you said. That's pretty high original condition. American collectors go nuts over high original condition. (original condition does not mean restored, of course).
