One of those stones that is not available in Japan anymore for sale !
It took me long time to convince my source to sell me that one :D
Very rare Tenjyou Karasu from Ozuku mine, they are on the softer side but like Nakayamas very very fine.
Also quite fast stones !
To get that stone is bigger size is just impossible and will cost a a LOT if you ever find one !
Becose of its ease of use and fines that stone is sutble for almost all tasks, Razors Tools and even Knives
Collector grade !
size: 135mm 80mm 25mm