Katana by Yamato no Kami Yasusada, a smith working in Edo, Musashi province, during the shintō period. The tang is signed 大和守安定 (Yamato no Kami Yasusada). According to the original seller, he came from Ishidō in Kii, trained in Edo under Izumi no Kami Kaneshige and also studied with the second-generation Yasutsugu; his work is renowned for its cutting ability. The blade has the typical Kanbun shintō shape: shinogi-zukuri, iori-mune, wide mihaba, a shallow sori of 0.8 cm and chū-kissaki, with a nagasa of 74.4 cm. The original seller describes a ko-itame jigane mixed with itame, with thick ji-nie and fine chikei, and a gunome hamon mixed with chōji, with yubashiri and tobiyaki, abundant ashi, deep nie with ara-nie and sunagashi; the bōshi is notare-komi with ko-maru and a fairly deep turn-back. The photographs show the irregular gunome running along the whole blade. The tang, with kurijiri tip and ō-sujikai file marks, has two mekugi-ana and appears intact in the photographs. The blade is kept in a shirasaya with an ink sayagaki and fitted with a gold-plated double habaki. It comes with NBTHK Tokubetsu Hozon Tōken papers, which are photographed.