Introduction of the sword from Wakedo Item Number: K381001 Sign: Hizennokuni Oumidaizyo Fujiwara Tadahiro dokoku jyunin Mutsunokami Tadayoshi Certif: [N.B.T.H.K] Jyuyo Touken Size: Blade length 73.9 cm Curvature 2.2 cm Mekugi 1 Hole Country: Hizen Period: First Edo Period Shape: Shinogi-zukuri, an inclined ridge, body width, thickness, with a slightly deep curvature, and a middle cut tip Forging: The surface has a fine wood grain, resulting in a steel texture referred to as 'kome-nuka', with fine ji-nuri Hamon: Straight with shallow undulations, with a small habuchi that appears bright and clear Boshi: Turns into a small maru immediately Tang: Unrefined, pointed sword shape, with a file pattern on the top Shirasaya: Present Description: Omi Daijo Tadahiro and Mutsu no Kami Tadayoshi were swordsmiths of the Hizen, Nabeshima Domain, belonging to the second and third generations of the Hizen swordsmith lineage. The second generation Omi Daijo Tadahiro was the son of the first generation Tadayoshi, and at the age of nineteen, he became the second head of the family after his father Tadayoshi passed away in the ninth year of the Kan'ei era, receiving the title of Omi Daijo in the eighteenth year of the Kan'ei era. He left behind many excellent works until his death in the sixth year of the Genroku era. The third generation Mutsu no Kami Tadayoshi was the son of Omi Daijo Tadahiro, receiving the title of Mutsu Daijo in the third year of the Manji era, and becoming Mutsu no Kami in the first year of the Kanbun era. Due to their long lives, the second generation outlived their father. The short period of sword-making and the brief time spent on works during his father's era resulted in an extremely low number of pieces. However, he was known for his exceptional handling of steel, demonstrating extraordinary talent, earning the title of the third generation Mutsu. This piece is a collaboration between the second generation Omi Daijo and the third generation Mutsu no Kami, with both the ji and ha being of excellent quality, making it a masterpiece. Although there are few works from the third generation, collaborations are even rarer and hold high documentary value.