The Mito swordsmiths worked under the Tokugawa branch house that governed Suifu (水府) in Hitachi province during the closing decades of the period. The gather two principal hands whose blades carry the date inscriptions of the Bunka through Keiō years, together with a by the tenth lord of the domain. Ichige Tokuchika (市毛徳鄰, also recorded with the title Ōmi-no- and at times read Tokurin), common name Genzaemon, was born in An'ei 6 (1777); he first studied under the domain smith Kume Naganori, then traveled to Osaka to train in the school of Ozaki Suketaka, and in Bunka 6 (1809) was taken on as an officially retained smith of the domain. Katsumura Tokukatsu (勝村徳勝), common name Hikoroku, was born in Bunka 6 (1809) in Mito and learned first from the domain smith Sekinai Tokumune; in Kaei 5 (1852) he was sent by domain order up to , where the records say he entered the circles of Hosokawa Masayoshi and the Ishidō smith Unju Korekazu, and in the Bunkyū years he relocated to the Mito residence at Koishikawa. The third name is Tokugawa Keitoku (順公, Junkō), tenth lord of the domain, whose survives in a black wax-lacquer mounting with hollyhock-crested fittings by the domain artisan Tamagawa Yoshihisa. The place all of this within the bakumatsu service of a domain whose Tokugawa loyalist temper is felt in the martial bearing of its blades.
The two productive hands do not share a single style, and the keep them apart. Tokuchika is read primarily through his Osaka schooling: a tightly forged with dense and fine , and a tempering range that runs from large swept into a billowing tōran manner after Suketaka, to a quieter with shallow that the writers compare to Shinkai and to Suishinshi Naotane. His characteristically opens with a , carries deep and thick , and shows and against a bright ; the turns in with a long . Tokukatsu reads as the opposite temperament. The describe broad, long blades of thick and shallow with an imposing martial form, forged in that tends toward standing grain, tempered in a base with shallow and intermittent , the breaking into with abundant and , and a swept with vigorous . The writers read in this a Yamato temperament and link his later work directly to the Shikkake tradition, noting that his early period followed Sekinai's and before he settled into the and of .
For , the recurring inscriptions Suifu-jū, Mito-jū, and Tosumi anchor the signatures, with Tokuchika's wording shifting from Mito-jū to Suifu-jū around the Bunsei era, a marker the writers use to date the work. Several blades carry named or recorded provenance: a Tokukatsu bears the inscription naming Sakai Tadahiro of Shizuoka, another is styled with the gō Shōri- (勝利剣, "Victory"), and a third was judged to carry a by his disciple Masakatsu. The also record the Imperial line: a signed Mito Hachiman-jū Ichige Tokurin entered the by presentation through the Governor of Ibaraki, and there the writers name Tokuchika the finest of the Mito smiths. appear rarely, the Tokukatsu with and in being noted as unusual for his hand. Across the corpus the writers treat Tokuchika's tōran and Shinkai-toned work and Tokukatsu's as the two distinct registers by which Mito blades of the bakumatsu are recognized.