A broad ko-wakizashi in ebi goshira-e mounts Edo period (1615-1868), dated 1837 Hirazukuri, iorimune with a thick kasane forged in ko-itame hada in jinie with a gunome midare tempered edge with nie, sunagashi, utsuri and one spot of tobiyaki, the ko-maru boshi with a long return, the ubu tang with kesho file marks, one hole, signed Koyama Sobei Munetsugu saku and dated Tenpo shichinen, hinoe saru, nigatsu no hi (A day in the seventh month of 1837), with a one-piece silvered copper habaki, 11 1/2in (29.2cm) long, 3/8in (.95cm) thick at the munemachi The Ebi goshira-e comprising a red-lacquer saya modeled to resemble the curled tail of a shrimp, the tip pierced to receive a decorative cord, the upper section wrapped with a shakudo band supporting the kurikata, the area below the shakudo koiguchi wrapped with fine cord lacquered black and polished smooth, the tsuka wrapped in lacquered leather and fitted with an iron fuchigashira decorated with a skull and bones among grasses decorated in gold and silver nunome-zogan, signed Toshichika with the artist's kao and dated Keio ninen tora chushu (Mid-winter 1866), the rounded-square iron tsuchimeji tsuba decorated with chrysanthemum petals