This mumei tantō dates to the late Edo period and measures 27.0 cm in length. The blade features a refined suguha hamon, embodying the understated elegance and precise workmanship characteristic of the period.
The accompanying koshirae is particularly distinctive, featuring a finely carved wooden saya decorated with traditional Ainu-inspired motifs. The intricate carving gives the mounting a unique regional character, making it both visually striking and historically appealing. The warm texture of the carved wood contrasts beautifully with the simplicity of the blade, creating a harmonious and tasteful ensemble.