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It might not be a Llyn Idwal, but, there are softer and harder types of the same stone. Same goes for the Charnleys, Grecians, and almost every natural hone. I have one Grecian that came with label...

Since no one is going to answer, I think it's a Llyn Idwal. When you doubt, it's a Llyn idwal. The colour of slurry, and I think I see flakes. How hard is it? They are generally finishers.