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I have a Puma microtome and yes it is a hard stainless. In case you missed it Randy, here is a thread on what I did with mine. Shaves well even if it is no longer usable for what it was made for. I...

I have no idea. All I know is that the ones I have honed have taken awhile. I always assumed that it was as Lee said, just age, corrosion and knocking around for 150 years.