This exceptional Japanese sword, inscribed with the signature “Senju-in,” is a fine example of Koto craftsmanship from the late Muromachi to early Edo period. The blade features a distinctive midare gunome hamon and a maru boshi, reflecting the aesthetic qualities and forging techniques characteristic of the Kamakura and Muromachi eras. Made in a shinogi zukuri style with a mune of iori, it displays rich itame and mokume hada patterns, highlighting the craftsmanship and artistry of the period. The good polish and age-appropriate patina accentuate its authenticity, and the original nakago remains intact, confirming its provenance.

The signature “Senju-in” suggests a possible association with a religious or regional workshop active during the Koto era. Such signatures often indicate a tradition rooted in spiritual or regional influences, adding cultural and historical significance. This sword embodies the artistry and heritage of ancient Japanese swordsmiths, making it a valuable piece for collectors and enthusiasts interested in the rich legacy of Koto swordmaking.