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That was written on the stone, I am hoping someone that knows Japanese can translate the kanji for me.

I think about 2 meters :borg:

yes naturals have ranges.
Roughly
Coarse: up to 1-2k
Medium:2k- 6k
Plishing: 6k+
The grit breaks as you use the stone, the longer you spend on the stone with the same slurry the finer the grit...

Picked it up from 330mate. The guy also gave me free Nagura(looks synthetic but I can't be positive)
Used for first time to work on a razor I sharpened for a member here.
I used the stone after...