As you can see, the case and caseback are pitted and badly damaged because the gasket failed.
The photos below show the pitting damage to the caseback.
The movement had gotten rusty and required a number of replacement parts before it was able to run again.
Note the poor quality repair to the plate jewel holding the oscillating weight.
This was a costly repair!
Keep in mind that some damage (such as case pitting) cannot be repaired, and affects the value of the watch. All of this could have been avoided with proper routine service.