The blades gathered here belong to a single -period line rather than an old Yamato workshop. Their maker signs 紀充, a name read in the registers as Kijū, Kishū, Kimitsugu, and Norimitsu, and he is recorded as Tsutsui -no-Kami Nyūdō. The place him as the son of -no-Kami Kanekuni, who in turn studied under the first-generation Tanba-no-Kami Yoshimichi of Ōsaka; one entry instead names his father as Tsutsui -no-Kami Kunisada, the Ōsaka milieu. He first used the name Terukuni (輝邦) and, from about Genroku 6 (1693), signed 紀充, with dated work running across Shōtoku 3 (1713) and the Kyōhō years 5, 9, 11, and 16 (1720 to 1731). One Kyōhō 16 carries a place inscription reading Washū Kōriyama, recording that he worked at Kōriyama in Yamato province; a second generation signing the characters is also attested.
His hand follows the Tsuda-style tōran-ba of the Ōsaka tradition. Across the group the is a large in tōran form, the wave crests broad and regular, with mixed in, entering, and running frequently through a deep with ; surface on the stronger blades. The is or tightly forged , repeatedly noted as tending to or -gakari toward the edge, with adhering. vary between a return and a deep turning back in . The is , , with shallow or and a ; are with file marks, the long cursive cut on the and the date and place set on the . The registers also caution that the steel does not reach that of Sukehiro or Sukenao, the tendency being the clearest tell of this hand against its Ōsaka models.
For the combination is specific: a broad tōran with frequent over an ground that flows to near the , signed by Tsutsui -no-Kami in a long cursive inscription. work and are recorded as rare; are the norm. Named pieces sit in the Imperial collection, including a Kyōhō 11 held by the Imperial Household Agency, and the dated and place-marked inscriptions are singled out as carrying particular value for study. The thus document an Ōsaka-trained smith who later settled at Kōriyama in Yamato, and the corpus is best read on those terms.
NOTE: The do NOT match the "Tsutsui / " label. They describe an -period (Shōtoku through Kyōhō, 1713 to 1731) Ōsaka-tradition tōran smith line (紀充, son of Kanekuni, in the Tanba-no-Kami Yoshimichi / Tsuda lineage) who worked at Kōriyama in Yamato province; the "Yamato" connection is geographic residence, not the tradition or the 1100 to 1400 era given in the identity file.