By Kiyomitsu, Edo period (1615-1868), 18th centuryOf shinogi-zukuri form, with ko-gissaki, narrow suguba of nioi with slender nie, indistinct hada, the ubu nakago with kiri yasurime and two mekugi-ana, signed Kiyomitsu; in shirazaya. The blade: 53.6cm (21 1/8in) long.