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Hello Eod7,

I have a stone with the same stamp (see picture).

I asked Mr. Teshiba-san what is written on it, and got following answer:

"It is written 三河本名倉砥 in stone of the image.
三河 is a...

Hi Maxim,

these are very interesting stones.
Could you please tell a bit more about them?
How old? From which mine? What is written on the lables?
I ask because they don't show the typical...