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Yes so have I. The ones I have seen have all been like that. From Iwasaki's nagura info, the yae-botan is a different layer than the botan, both layers just below the koma layer. I was wondering...

Remember that these 'grades' are not a designation of quality, they only denote the shape and colour of the nagura stone. The 別上 (betsujou) means only that the stone is a predominantly white colour...