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I think I read somewhere that the Carborundum numbers mean a larger size to the grit meaning a coarser hone. The silicon carbide was all the same hardness, but of different size, thus different...

I recently found an old, embossed, black box carborundum at a local antique haunt. There was no number on the stone or box, but it turned out to be an incredible finisher! It has now moved to the top...