Mumei Koto Katana with Sayagaki. A mumei Koto Katana with sayagaki, attributing this blade to Bizen Suke Sada during Te-SHo reign (1573). It has a 26⅜” cutting edge and a choji midare hamon. The hada is itame and the nakago has one hole. The habaki is two piece with gold foil.