Ordering number: 20569
Tachi in Shirasaya(NBTHK Tokubetsu Hozon Paper)
Signature : Kaga Ryosanshi Masamine Saku Kore(Living National Treasure)
Showa Kanoto I Nen 2 Gatsu Hi (Feb 1971)
(We divide 4 sections for each sword as Saijyo saku, Jyojyo saku Jyo saku and regular saku)
This sword belongs to Jyo Jyo Saku ranking.
The blade is polished.
Blade length : 71.5 cm or 28.14 inches.
Sori : 2.5 cm or 0.98 inches.
Mekugi : 1
Width at the hamachi : 3.37 cm or 1.32 inches.
Width at the Kissaki : 2.57 cm or 1.01 inches.
Kasane : 0.72 cm or 0.28 inches.
Era : Modern times(1971)
Shape : Wide and thick Katana with large Sori.
There are Bo-Hi on both side of the blade.
Jigane :Ko Itame Hada well grained with Jinie attach.
There are fine Chikei. There are also Utsuri.
Hamon : Ko-Nie Deki, Choji Midare with thick Nioikuchi.
In Ha, there are Sunagashi and Kinsuji.
Boshi is Midarekomi pointed style.
Special feature: Sumitani Masamine, born Sumitani Yoichiro in 1921 was a swordsmith in Ishikawa pref. Major in mechanical engineering and graduated from Ritsumeikan university in Kyoto, he entered the researce institute of Japanese sword on the campus in 1941 and learned under Sakurai Masayuki, the Second son of a famous swordsmith Sakurai Masatsugu. After that he moved to Onomichi city in Hiroshima pref. and learned forging and polishing sword at Kokoku Nihonto Tanren-Jo with his sworn brother Yokota Masamitsu.
In the postwar Japan, Masamine set up his own smithy named Sanryutei in 1956 and studied Bizen-den. He forged special swords to dedicate the Ise-jingu shrine in 1964, 1966, 1969 and 1989. He became a Mukansa-tosho and a judge of the annual sword-making competition held by NBTHK in 1966. In pursuit of Bizen-den, he completed especially choji-midare hamon called Sumitani-Choji. He also studied old iron manufacturing in Kamakura period and reproduced classical texture of jitetsu.
Masamine was designated one of a preservers of Important Intangible Cultural Assets, popularly known as Living National Treasures in 1981. He passed away in 1998.
The hisoty of the age of the blade was made.
1971,February ,5th American air space crew members were landed at the Moon.
NBTHK Tokubetsu Hozon Paper
Aoi Art estimation paper : whole Oshigata.