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Many razors made of stainless will say so. The ones I've seen form the 60s seem to all say so but the few I've seen from when they first started using stainless did not say it. I'm sure the coffin...

Most stainless razors are from the late 1950s and later. There are some from the 40s and before that it would be very very rare.

Some stainless is non magnetic but depending on the alloy it might...