KOYAMA MUNETSUGU (ACTIVE CIRCA 1830-1860) A Ken in Impressive Mounts Edo period (1615-1868), 19th century Kenzukuri forged in itame hada and with a ko-gunome tempered edge, chiseled with bōhi along the shinogi on both sides, the ubu tang with two holes, katte sagari file marks, signed Munetsugu kore o tsukuru and inscribed with a poetic inscription, with a one-piece copper habaki inscribed Inazuma (Lightning), and Kaminari (Thunder); the koshira-e mounted with brass fittings cast and chiseled in