I have quite a few Gillette safety razors that seem to have no plating loss on the whole razor, except under the head. Nothing is rubbing/wearing the razor under the head. I was thinking the plate loss might be due to a chemical reaction with the plating and the shaving cream they used in the day? I am talking mostly about 1940's and 1950's Super Speeds. A lot of people didn't rinse their razors after a shave, so I wonder with the residure shaving cream sitting on the razor might have contributed to loss of some plating down to the brass?