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Imanishi is a large company associated with Bester stones & probably others as well. They no doubt retail Jnats also.
As Tierdaen said, however, ink stamps are no guarantee of provenance. That the...

It says 'lap well to remove this graffiti.'

On a more serious note. Could you ask the seller for a translation?

Edit: I have a Yaginoshima stone with the same last 2 Kanji as on the right side...