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A few years ago I bought a Gillette old type (pre-1920) with a few NOS blades still in the wrapper. I took one out and shaved with it. It had no visible corrosion but I'm sure it wasn't as fresh all...

Been awhile since I looked at the Krumholz book but in the first few years of their manufacturing one of the services Gillette offered was that you could send the blades back and have them...