KOYAMA MUNETSUGU (固山宗次) was a Japanese swordsmith in Musashi province.
- Born in Shirakawa, Mutsu province (Fukushima, Miyagi, Iwate and Aomori Prefectures today)
- Active in Musashi province (Tokyo metropolis today)
- Late Edo period
- CHOUNSAI TSUNATOSHI(長運斎綱俊)
- Kato Tsunahide(加藤綱英)
- Tairyusai Soukan(泰龍斎宗寛)
Shape : Wide and thick.
Hada : Clear and bright ITAME-HADA(板目肌) grained very well so that it almost appears nothing, looks like a mirror.
Hamon : NIOI-DEKI(匂出来), irregular CHOJI(丁子).
Boshi : MIDARE-KOMI(乱れ込み).
Others : Master of BIZEN Tradition(備前伝).
- Koyama Munetsugu was born in 1803, he had 2 elderly brothers, Koyama Munehira(固山宗平) and Koyama Munetoshi(固山宗俊).
- He learned under Kato Tunahide(加藤綱英). But apparently Tsunatoshi’s younger brother Chounsai Tsunatoshi influenced his sword making.
- He was close to the sword testers namely Yamada Asaemon(山田浅右衛門), Yamada Gosaburo(山田五三郎) and Iga Tomoo(伊賀兎毛). So that many his swords have SAIDAN-MEI(裁断銘).
- He left many well-made swords throughout his active period of 43 years, and it’s okay to say that Munetsugu reached his prime in Tenpo era(1830-1844), considering that over half of his works designated NBTHK Juyo Token (important sword) are from that period.