Overview of the Shinto Era

Shinto (新刀) refers to swords crafted from Keicho 1 (1596) onward in Japanese sword history's chronological classification, serving as the antithetical concept to ko-to (古刀) and forming a foundational concept in authentication and research. Regarding the end of the Shinto period, various theories exist, but the established convention marks the division around the Horeki (1751–1764) through Meiwa (1764–1772) period, with all subsequent blades called Shin-shinto (新々刀).

The Shinto era is grounded in the social transition from warfare to peace—the world of Tokugawa peace following the Battle of Sekigahara (1600) and the Siege of Osaka (1614–1615). This peace fundamentally transformed sword culture. The functional demand for combat blades receded, and "peacetime functions" of appreciation, status display, and gift-giving moved to the fore. Simultaneously, the Shinto period is characterized by a bifurcation: mass-production systems responding to nationwide samurai demand, and high-grade commissioned blades for the shogun and daimyo households.

The technical characteristics of the Shinto era are distinctly apparent in comparison to ko-to. The most pronounced changes are in jigane forging—whereas ko-to was primarily itamehada and koitamehada, Shinto exhibited greater diversity with ōitamehada, mokume, and masame—and in hamon evolution—from the complex niede-based hamon of ko-to to the pursuit of nioideki and bright, clear sae in Shinto. Particularly notable is the Bunbun-era style onward (1661–1673), known as "Bunbun Shinto," characterized by shortened blade length, shallow curvature, jigane dominated by itamehada, and bright, clear niokuchi—embodying the aesthetic of "blades of peace" born from Tokugawa tranquility.

The three major production centers of Shinto were Edo, Osaka, and Kyoto, each developing distinctive styles in response to different patron demands. Edo produced both formal, refined blades for the shogun and daimyo and practical swords. Osaka established itself as a unique brand with "Osaka Shinto," renowned for lustrous and refined aesthetic pursuits. Kyoto saw the continued activity of traditional schools such as the Horikawa lineage and the Sanshina school, inheriting the spirit of ko-to while responding to new-era demands.

The three great masters of the Shinto era are considered to be Horikawa Kunihiro (from Hyuga, working in Kyoto), Echizen Yasushige (from Fukui to Edo), and Nagasone Kotetsu (Edo). Horikawa Kunihiro was a pioneer who brought the spirit of ko-to into Shinto, among the earliest Shinto smiths to craft blades with the ideal of "ko-to revival." Echizen Yasushige served the Tokugawa house and various daimyo as an official smith, establishing the style of refined Shinto blades. Nagasone Kotetsu, as the culmination of Edo Shinto, received acclaim known as the "Kotetsu craze" and achieved lasting prominence through association with Kondo Isami's celebrated blade in the late Bakumatsu period and beyond.

Although the Shinto era was critically superseded by the Shin-shinto era (from 1781 onward, including the ko-to revival movement led by Suishinshi Masahide), this criticism itself maintained a dialectical relationship presupposing Shinto's achievement. The fact remains that the approximately 185-year Shinto period formed the structural foundation of Japanese sword history.