Sanetsune is a swordsmith of the tradition who inherited the lineage of Masatsune, one of the foundational figures of the school. Active in the early period, he represents the continuation of the oldest stratum of Province smithing. Several signed by Sanetsune survive, and designation records consistently note correspondences in both workmanship and manner of signing among these extant pieces, confirming a coherent body of work within the Masatsune line. His signatures are typically rendered in two characters cut with a somewhat thick chisel, placed in a manner characteristic of the group.
Sanetsune's forging displays the hallmarks of craftsmanship. The is worked in mixed with , compacted in a tight and disciplined manner, with present and entering well. His tempering is characteristically a -toned mixed with , exhibiting abundant and . The is bright, with thickly adhering , and the is enlivened by frequent workings of and . The tends toward a straight form with a slight return. His blades display the slender , pronounced , and that define the archaic silhouette of the late to early transition, conveying a distinctly classical dignity described in the records as possessing an archaic character (koshoku).
Sanetsune's significance lies in his position as a direct heir to the Masatsune line at the very origins of the tradition. His works preserve the restrained elegance and archaic flavor that distinguish from the later, more flamboyant and schools. Designation records emphasize that even blades attributed to him with some uncertainty can be confidently placed within the closest relationship of his immediate line, underscoring the coherence and documentary value of this earliest generation of smithing. His , though often shortened, retain an elegant shape with high that is particularly appealing, and both and possess the dignified presence characteristic of workmanship.