Ohira suita, I think. Came in the mail today. Not a razor finisher, but a tool and knife stone. I have three of these on the way (it's nice to try several and see which is best). There is nothing to scale it against in the picture - it is a 30-type sized stone, 45mm thick.
https://s2.postimg.org/p09y49azp/P1100106.jpg
https://s2.postimg.org/6980u3gf9/P1100107.jpg
https://s2.postimg.org/fjk4xmr51/P1100108.jpg
https://s2.postimg.org/oq2fkwwdh/P1100109.jpg