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The color of yours looks like my smaller one. I read somewhere that the higher numbers on the hone meant a finer grit. Don't quote me.

I believe my smaller Carborundum was harder to lap than a...

Carborundum was both a "material name" and the name of "The Carborundum Company" of Niagara Falls, NY.

The company made some neat, fine, razor/barber hones from carborundum powder, in different...