A later Soshu katana Edo period (1615-1868), dated 1816 The broad blade of honzukuri, iorimune configuration with toriizori curvature and an extended kissaki, forged in ko-itame hada and with an o-choji midare tempered edge based in nie, with ashi, yo and utsuri, and a midare komi boshi, the ubu nakago with kiri file marks, one hole and signed Masamune masson Sagami no kuni Tsunahiro, dated Bunka jusannen nigatsu (Second month of 1816) and inscribed O Watanabe kore ju, with a one-piece copper habaki, 27 15/16in (71cm) long; in a wood shirasaya storage scabbard With Kantei certificate no. 16097 issued by the Nihon Token Hozon Kai (Society for the Preservation of the Japanese Sword), dated September 3, 2006