I've seen these sell between $500 to $700 if complete. I can't tell from the picture if the face plates are there, if missing that would hurt big time, hard to find. They are rather large which is a take away on value.
No idea on restored value, way to subjective.
The color combo suggests Mobil Gas Special. An original Fire Chief would have been solid red. Sometimes you can tell by the hole pattern where an original sign used to be. Then again maybe someone had some red and white paint left over and liked the color combo...lol.
Tom.