Quote Originally Posted by Nikolay View Post
As far as I know Kuroda Takeshi has no it's own stamp to put on the stones that hi is selling.


As for this stamp:
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this is the stamp of "Kyoto Natural Hone Sales Association" ( Jnat Stamps | TomoNagura.Com | Keith V. Johnson )



No. It is not a SUITA. It is AWASE-DO ( 合砥 ). And the stamp on top left corner denotes it.
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the kanji inscription in stamp is 純本山合砥 ( 「純本山 合砥」--- jun-honzan-awase do )

「純 」 --- pure
「本山」--- honzan
[honzan] is a general term for whetstone mountains of Kyoto.
「合砥」 --- awasedo = fine honing stone


More hi-res photos: Awase Toishi Photos by Ostritel | Photobucket
From the pics this stone looks like a suita. Awasedo means finishing stone and is not related to the strata of stone.