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A friend of my father in law who is from Japan got back to me and told me it simply said "fine finishing stone" no mention of a grit number at all. I'll have to do some careful observation and see...

Thanks for the quick response, Any way to know for sure what grit it is? It actually feels smoother than my Norton 8K.

Hi,
I just found a fairly fine stone at a thrift store. It seem to be a vintage Naniwa judging by the box. I have looked up the number and nothing comes up. Wondering if anyone knowss anything about...