Japanese sword
Historically in Japan, the ideal blade of a Japanese sword has been considered to be the (lit., "old swords") in the Kamakura period, and the swordsmiths from the Edo period (1603–1868) to the present day after the (lit., "new swords") period focused on reproducing the blade of the Japanese sword made in Kamakura period. There are more than 100 Japanese swords designated as National Treasures in Japan, of which the "Kotō" of the Kamakura period account for 80% and the "tachi" account for 70%.