If you've got confirmed information about the particle size of another stone (Suehiro or such) please post it here.
This was originally published in a Lee Valley mail order catalogue. I have scanned it and am posting it here for posterity and for the benefit of those people who might not be fortunate enough to live in a country where LV distributes.
The "Bester 100x" at the bottom left of the table is a typo, it should be Bester 1000x. The Sigma 1000x 4 down from the top left should read Sigma 10000x (1.5 micron).
"Sigma" references Sigma Power Select II stones. The King 200x is a big green stone I've never seen anywhere other than LV before.
Hope this helps.