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Thanks for your comments. Actually, that's my mistake on thinking that the Naniwa dressing stone was a piece of 800 Pro/Chosera. Apparently, it's 600 grit not 800, and the coloration does not match...

I have a traditional 1.5k Naniwa synth that I picked up a couple of years back to experiment in cutting it down to smaller size. As such, it works well as a mild bevel-setter for hand-held honing...