While the Bungo-Takada school is renowned for crafting sturdy swords designed for practical use, Sadayuki’s works stand out for their exceptionally beautiful finish. **Shape (*Sugata*):** The blade exhibits a powerful profile characteristic of the *Shintō* (New Sword) era, featuring a relatively shallow curve, substantial blade width, and a distinct taper from the base to the point. **Forging (*Jitetsu*):** The steel displays a fine, uniform *itame* (wood-grain) pattern, accented by *ji-nie* (surface crystalline particles) and dynamic *chikei* (dark, linear markings within the steel). It is characterized by a beautiful texture reminiscent of Hizen swords. **Temper Line (*Hamon*):** Although the school excels in *suguha* (straight temper lines), Sadayuki also skillfully creates flamboyant patterns, such as *gunome-midare* (undulating patterns) with uniform peaks and *kawazu-ko midare* (patterns resembling tadpoles).

A major strength of Sadayuki’s swords—which are deeply associated with Miyamoto Musashi—lies in their construction, perfected for practical combat effectiveness and exceptional cutting ability. The fact that Musashi favored one of these blades as his personal sword during his later years is recorded in *Bukōden*, a biography of the swordsman. Following Musashi’s death, the sword was passed down to his retainer, Okabe Kuzaemon.