A fine and unusually shaped naginata-style tantō dating to the late Muromachi period (16th century), forged in a bold and highly martial form characteristic of the Sengoku era. Unlike a true naginata-naoshi, this blade appears to have been originally forged in naginata style rather than later shortened from a polearm, retaining a well-balanced and natural overall construction.
The blade measures 17.7 cm and features a wide mihaba with an elegant sweeping profile and elongated point, giving it a striking and powerful appearance despite its compact size. The sugata displays strong late Koto characteristics, emphasizing functionality and aggressive presence over later-period refinement.
The hamon is executed in an undulating midare pattern with rounded gunome elements, showing a lively yet restrained character consistent with practical battlefield-oriented workmanship of the period. The jihada is a visible itame-hada with flowing grain patterns and clear forging texture throughout the blade surface, producing an unmistakably old steel appearance with considerable depth and activity under light.
The ubu nakago retains a deep natural patina and a single mekugi-ana, further supporting the blade’s authenticity and age. Overall workmanship suggests a Sue-koto tradition piece, possibly associated with Mino influence or a provincial school active during the turbulent wars of the 16th century.