Vintage Nakayama from Kato era (1950-60s) mounted on a more recent wooden dai. This is a tool grade toishi that could be used with razors as a middle stone. It is a fast cutting stone with a wide range of steels from blue paper to white paper steel and some exotics. Sold with a money back guarantee minus the shipping, it is worth a test run as long as the ink stampes are not rubbed out. I of course have tested the stone and these "mild" kan circle pattern stones are stones really great.
Mohs scale 5,
Size 206-75-33mm thick
$775
Irregular shape is reflected in the price.
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#262 Nakayama kan pattern Tomae
All of my stones are sold with a money-back guarantee minus the return shipping if within 30 days of the sale and returned in their original state. Please do not lacquer the stone if you have any intention of returning it.
I encourage sealing the sides of all sedimentary stones, especially if there a inclusions, cracks, or fissures and or if the stone is used in an active workshop where the stone is constantly wet. For casual use, sealing, especially all four sides, and preferably the back with one of either a marine type of spar varnish, a synthetic lacquer, urushi, or a cashew-derived lacquer is prudent.