A Japanese work bearing the signature Sōshū-jū Tsunahiro (相州住綱廣), measuring approximately 66.2 cm in length with 1.6 cm of sori. The hamon displays a lively, undulating pattern, complemented by a remarkably clean jihada and a pronounced, bright nioiguchi that gives the temper line excellent definition.

Tsunahiro was a distinguished smith lineage associated with the Sōshū tradition, established in Odawara under the patronage of the Hōjō clan. Active from the Muromachi period onward, successive generations maintained the tradition into the Edo period, producing works known for their distinctive tempering patterns and refined forging. The overall feature suggest an early Edo period origin, approximately the 17th century.

The piece is accompanied by an exceptionally well-preserved Japanese Imperial Navy Kaiguntō mounting, featuring genuine sharkskin on the scabbard. One of the menuki bears a family crest. The elaborate mounting and family crest are consistent with a high-ranking naval officer’s personal sidearm.