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This Canadian WWII Tech shaves beautifully, but the plating is not that great. One flea-bite and a bit of 'bubbling' on top of the head, and underneath, there is a patch where it has worn off completely. Underneath, as you can see in the picture, the metal is black and rough to the touch. It seems to cause rust on blades after a few days. Any idea what the metal is, why it reacts like this, and if there's anything I can do (short of replating) to make it better? I'd like to keep shaving with it, but the rust on the blades is not ideal.