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I did come across that thread however it has a couple of points that make me think it is about a different company.

Lynn says "I believe that is the 1K I just tested. Fairly expensive for a 1K. "...

I can't seem to find any information other then a few sparse reviews on Amazon regarding this stone.

Japanese whetstone waterstone sharpening stone Suehiro1000/3000 toishi sharpener | eBay

Its...