A katana koshirae
The fittings by Omori Hideuji (Hidechika), late 18th century
The saya of ribbed roiro lacquer; the polished shakudo tsuba carved in takabori with a dragon amid swirling clouds, signed Hidechika with kao; the fuchi-gashira of shakudo ishime, carved with breaking waves in similar style, signed Hidechika with kao; the kojiri and kurikata similarly carved.
Total length 104cm (41in).
Footnotes

刀　無銘　18世紀後期　附　黒蠟色塗印籠刻鞘打刀拵

Accompanied by a NBTHK Tokubetsu Hozon certificate.

For the maker of the fittings, of whom Hidechika was a go or art name, see Robert Haynes, The Index of Japanese Sword Fittings and Associated Artists, no. H01206. He was the second son of Omori Teruhide and worked in his father’s style.

source: https://www.bonhams.com/auctions/18980/lot/4/