What appears to some as excessive corrosion may only be a small amount. Or could be a real mess. A photo of that coin would help decide that. Just saying corrosion needs to be more accurate. To some people tarnishing, staining, toning is all corrosion. To some toning is worth more monitarily.
However, if what you discribe is really corrosion, that could effect the value extensively since Shield nickels are not to much an expesive coin.


















