It's sound in this area and not right through but it is somewhat pitted. Untested but battery compartment looks unaffected and is very clean and dry with no corrosion. There is some corrosion on the right'ear' and the chrome strip below the helmet screen. The lid of the box has corner wear, some lighter marks, light crease and folds.
Please look at the images as they form an important part of the description and will give you a good idea of condition. Questions and reasonable offers always welcome.