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About the school

Kotetsu School虎徹派

Nagasone Okisato, who took the smithing name *Kotetsu* (虎徹), began his career not at the forge of the swordsmith but at that of the armorer, working as a *katchūshi* in Echizen Province. Around Meireki 2 (1656), when he was about fifty years of age, he relocated to Edo and changed his profession to swordsmithing, settling in the area of Tōeizan and Shinobugaoka. The setsumei record that his common name was Sannojō; he first signed Okisato, and after taking Buddhist vows styled himself Kotetsu Nyūdō. The written form of the name itself moved through stages, beginning with the characters 古鉄 ("old iron"), shifting to 虎徹, and from the eighth month of Kanbun 4 (1664) onward to the variant forms 乕徹 and 馬徹. His dated blades run from Meireki 2 to Enpō 5 (1677), the latter being the last year for which work survives. His pupil and adopted son Nagasone Okimasa (興正) succeeded him as the second generation, working from Kanbun 13 (1673) to Genroku 3 (1690); the registers note that certain blades signed by the master were in fact Okimasa's *daisaku*, or substitute work. The setsumei describe a shared vocabulary that holds across the line. The foundation is a strong *jigane*, forged as a tightly packed *ko-itame* in which *ji-nie* adheres thickly, fine *chikei* enter, and the steel reads bright and clear; a mottled inclusion the catalogues call *teko-tetsu* or *tekkotsu* appears as a recognized trait. The sugata is the robust Kanbun-shinto silhouette, with shallow *sori*, marked taper from base to tip, and a *chū-kissaki*. Most blades open with a short straight *yakidashi*. The hamon falls into two recorded phases: the earlier *hyōtan-ba*, a gourd pattern in which large and small *gunome* connect with pronounced rises and falls, and the later *juzu-ba*, the rosary-bead temper of round-headed *gunome* linked along an even line, often worked over a shallow *notare*. Thick *ashi* enter, the *nioi* runs deep, *ko-nie* lies thickly, and *kinsuji* and *sunagashi* play within the *nioiguchi*, which is consistently bright. A *bōshi* that crosses the *yokote* in *gunome* is named in the registers as the characteristic "Kotetsu *bōshi*." Several blades carry horimono cut by the smith's own hand, from Fūjin and Raijin to Kurikara and Sanskrit seed-syllables, and the cutting reputation is documented through gold-inlaid *kinzōgan* test inscriptions on the tang. For the collector, recognition turns on these named points: the *juzu-ba* of the mature work, the bright order of *ji* and *ha*, the *teko-tetsu* in the ground, and the long signature in fine chisel-work centered on the *shinogi-suji*, with the first character cut so as to overlap the *mekugi-ana*. The catalogues distinguish the earlier *hane-tora* manner of writing the *tora* character from the later *hako-tora* phase, which they treat as a dating tool. The cutting-test inscriptions give Kotetsu a place among the swords valued for performance as well as form, and the rarity of certain shapes adds weight: tantō by his hand number perhaps fewer than ten, and in those the *Sōshū-den* feeling is described as especially strong. Named works carry provenance through the front rank of collecting, among them a katana transmitted in the Nabeshima family of Hizen and known as "Nabeshima Tetsu," confirmed by a *sayagaki* of Satō Kanzan, and blades formerly held by figures such as Inukai Bokudō. Okimasa stands a step behind his master in the registers, his deeper *nioi* and thicker *nie* read as a personal voice within the inherited *juzu-ba*. The line occupies a central position in the study of Edo shinto, its work measured by the strength of its steel and the discipline of its bright temper.

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