Hosokawa Masamori, a smith of the Hosokawa house and retained swordsmith of the Tsuyama domain in Mimasaka, was the son of Hosokawa Masayoshi, a pupil of Suishinshi Masahide, and followed his teaching, working chiefly in the Bizen tradition. This katana, with a nagasa of 77 cm and a sori of 1.4 cm, is in shinogi-zukuri with an iori-mune, wide, thick in kasane and with an ō-kissaki, an imposing late-Edo profile. According to the original seller, the jigane is a tight ko-itame with ji-nie, and the hamon a chōji-midare mixed with gunome, with plentiful ashi and ko-nie; the bōshi runs in midare and turns back in a slightly pointed ko-maru. The photographs show the full blade and a well-defined irregular hamon. The tang is ubu, with sujikai yasurime and keshō-yasuri, a kurijiri tip and a single mekugi-ana; the omote bears the signature 正守 (Masamori) with a stamped seal, and the ura the date 文久三年八月日 (Bunkyū sannen hachigatsu hi). It is kept in shirasaya with its bag and a gold-plated copper habaki. The original seller states an NBTHK Tokubetsu Hozon Tōken certificate issued in 2016 and the Japanese registration.