The Suishinshi Masahide school was the fountainhead of the movement, established by Suishinshi Masahide (1750--1857) of Dewa Province, who articulated and practiced the influential doctrine of -- the restoration of classical swordmaking models. From his position in , where he served the Akimoto family from An'ei 3 (1774), Masahide trained many disciples over a career spanning some fifty years, and from this circle emerged the two talents who would bring his revivalist philosophy to its highest realization: Naotane of in Dewa, whose technical skill was appraised as surpassing that of his teacher, and Jirotaro Naokatsu, Naotane's adopted son and the third most accomplished smith of the lineage. The school also produced Chounsai Tsunatoshi of Yonezawa, a domain smith for the Uesugi clan, and the master Sukemasa, whose mid- represented an entirely different historical pole from which the revivalists drew inspiration. Together, these smiths constituted the principal current of the era's conscious return to ideals.
Masahide's own career divides into two clearly defined phases that chart the school's intellectual evolution. In his early and middle period, he took the Osaka masters as his ideal, producing toran- in the manner of Tsuda Sukehiro and reminiscent of Inoue Shinkai, with a tightly packed tending toward a -like surface and a characteristic coarse, blackish that the identifies as "a habitual trait of his workmanship." In his later years, he turned decisively to -, pursuing in with tight and his signature -- a moist, soft quality in the temper at the . Naotane carried this revival to its most accomplished expression, forging with thickly adhering , a distinctly standing , and a mixed with , , and -ba often showing a reverse tendency (), with a brightness and clarity that approach the impression of . His -tradition works, by contrast, display mixed with large and a distinctive swirling uzumaki-, with thick , vigorous and , and a martial vigor the term . Naokatsu worked in both and modes with a boldness that sometimes surpassed his master, his of -like flavor tending to become larger in scale and more heroic in bearing. Tsunatoshi's production likewise demonstrates the school's range, spanning in , , and toran-, all built upon the characteristic tightly compacted that tends toward a -like appearance.
The Suishinshi Masahide school's historical significance is defined by the intellectual ambition that animated its production: not merely to forge excellent swords, but to recover the aesthetic principles of the classical traditions and demonstrate that craftsmanship could attain the spirit of . Masahide's early Osaka emulations are judged "particularly fine" -- works "of such a character that it could be mistaken for the work of the Tsuda group" -- while Naotane's -style masterpieces achieve a "bright and keen, with both and luminous and clear." The celebrated "Tsukikage Naotane," bearing a poem chiseled on the tang, stands as the outstanding exemplar of the school's -revival ambitions. Naokatsu's finest works reach "a level of brilliance that can stand alongside Naotane's masterpieces," with one blade held in the Imperial Collection attesting to the esteem in which the lineage was held. Naotane's provincial journeys -- forging with the Ota family of hereditary iron-masters in , traveling through , Izu, and -- further document the school's commitment to understanding regional materials and forging traditions at their source. From Masahide's theoretical writings to Naotane's practical realization, the school collectively embodied the era's defining aspiration: to bridge the centuries separating modern craftsmen from the classical masters and to demonstrate, through works of genuine brilliance, that the bridge could be crossed.