Katana : Koyama Munetsugu Saku/Tenpo 6 nen 8 gatsuhi
Katana in Shirasaya, with Koshirae. (NBTHK Tokubetsu Hozon paper)
Signature : Koyama Munetsugu Saku
Tenpo 6 nen 8 gatsuhi
The blade was polished
Habaki : Gold foiled bouble Hanbaki
Blade length : 70.2 cm or 27.64 inches.
Sori : 1.73 cm or 0.68 inches.
Mekugi : 1
Width at the hamachi : 3.04 cm or 1.19 inches.
Width at the Kissaki : 1.93 cm or 0.75 inches.
Kasane : 0.71 cm or 0.27 inches.
Era : Late Edo period. Tenpo era. (February, 1835)
Shape : regular size Katana with Sori.
Jitetsu :Koitame had well grained with jinie attached. The hada is clear and beautiful.
Hamon : Nie ground, deep nioiguchi in gunome midair line.
Ashi is thick with many activities such as sunagashi and kinsuji works.
Special feature : Koyama Munetsugu is called Soubee.
He had the pen name Issensai and Seirosai and also received the signature of Bizensuke.
He was born in Mutsu Shirakawa(Now Shirakawa city, Fukushima).
He has become a student of Katou Tsunahide with his older brother Koyama Munehira and learned forging skills.
First, he has worked under Shirakawa Hanshu Matsudaira Sadanobu.
At Bunsei 12th year(1829) Munetsugu followed the Matsudaira family
which moved to Kuwana(Mie prefecture now).
There are signatures that engraves Kuwana at this time. Late on, he moved to Edo to forge more swords.
By the Tempo period, he has eagerly brushed up his skills and made some of
the highest quality swords with gorgeous choji midare with gunome midare mixed.
Tsuba : Round shape brass Tsuba, dragon is engraved with open work.
Fuchikashira : Kojiri: Iron
Saya : Kawari Nuri Saya
Menuki : flowers are engraved.
NBTHK Tokubetsu Hozon paper
Aoi Art estimation paper : whole Oshigata.