武士刀 - 鋼 - Senjuin/ Mihara - 日本 - 室町時代（1333-1573）

Antique Japanese Sword Daisho Signed by Senjuin/Attributed to Mihara NBTHK Hozon Certificate

Signed by Senjuin (千手院)/ Attributed to Mihara (三原: Unsigned)

Katana - Dai
This blade was signed by Mino Senjuin (美濃千手院), which is one of the most famous schools during the late Nanbokucho-late Muromachi period (Mid 14th-Early 16th century) in Mino province (today’s Gifu prefecture). According to NBTHK that appraised this blade, it was approximately made during the mid-late Muromachi period (Late 15th-Early 16th century).
Cutting Edge Length(Nagasa)： 68.9 cm ( 27.1 inches)
Curvature(Sori)： 1.9 cm (0.75 inches)

Wakizashi - Sho
This blade is attributed to Mihara, a prestigious school in Bingo province (Today’s Hiroshima prefecture). According to recent studies, it is general knowledge that Mihara school was founded by Kokubunji Sukekuni (国分寺助国) in the late Kamakura period (Late13th century-Early 14th century). Two of the most prominent figures in this school are Mihara Masaie (三原正家) and his son, Masahiro (正広).
Cutting Edge Length(Nagasa)：0 40.6 cm (16.0  inches)
Curvature(Sori)：0.45 cm (0.18 inches)

NBTHK
This Katana and Wakizashi blades are appraised as Hozon Token(保存刀剣) . They were issued by NBTHK(Nihon Bijutsu Touken Hozon Kyokai:日本美術刀剣保存協会). These authentication papers were only given to authentic Japanese swords well preserved and high quality with artistic value.

*Please keep in mind that there are a few Kitae Kizu on the Katana and a couple of them on the Wakizashi.

Dai-sho
What makes this set particularly compelling is the opportunity to see two distinct traditions from the same era side-by-side: a signed Senjuin katana and a Mihara wakizashi (or ko-wakizashi), both accompanied by NBTHK Hozon papers.

A Complementary Pair
Although not an original historical daishō, these two swords form a remarkably harmonious combination.

Shared Characteristics

Both blades:
Date to the Muromachi period
Display strong Yamato influence
Embody a restrained warrior aesthetic
Were designed with functionality in mind
Reflect practical military use rather than ceremonial display

Together, they present a coherent and historically sympathetic pairing, united by a shared philosophy of understated craftsmanship, martial purpose, and enduring elegance.