The name Masazane is borne by smiths of markedly different lineages and eras. The earliest is Masazane, whose period of activity is traditionally placed around the Joo era (1222-1224) of the early period; extant signed works are exceedingly rare. A later Masazane appears in the Yamato Monju lineage, a group that established its forges at Tawara in Province around the Bunki and Eisho eras of the early sixteenth century, producing blades in a style without structural faults that came to be known as " Monju." Yet another Masazane, signing Fujiwara Masazane, was a student of the first-generation Muramasa, working alongside Masashige in a related but subtly distinguishable manner.
The work presents the hallmarks of its school: a slender with high and small , its mixed with bearing and abundant . The is a mixed with and , thickly covered with , yielding an antique elegance. The Muramasa-school Masazane favors a distinctive tempering pattern with the aligned on and , clearly reflecting the characteristic traits of that group, while tending toward a somewhat tighter than his fellow student Masashige. The Monju Masazane produces a -cho with and well-adhering , distinguished from the Sengo Masazane by taka-no- that indicate Yamato rather than origin.
Each Masazane lineage contributes documentary value precisely because signed examples remain scarce. The in its state preserves a refined and brilliant of great antiquarian significance, while the Muramasa-school and Monju works illuminate the distinctive regional idioms of their respective traditions.
