Artificial Kaisei stone.
3rd stone of the groundwork used before Chu-nagura-do.
By Kaisei-do, the mark of Binsui-do must be removed and the surface of the sword will get smoother and finer.
It is much Harder than Asahi Kaisei-do or Kaisei-do Tokkyuhin
Dimensions : 20.5 x 5 x 6.5cm
1240g
