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Oddly, I have never bought or even used one. The ones I've seen looked a bit rough for razors. The scythe, slip, and pocket types are fairly easy to find around southern Indiana. I'll pick one up the...

http://igs.indiana.edu/Survey/projects/gravestones/whetstone_industry_poster.pdf

I see the stones fairly often in flea markets and elsewhere, mostly in southern Indiana.