Recently purchased this tsuba as a possible Yagyu tsuba of the early Edo Period (circa 1615-1670). The following are the major kantei points for my attribution. The brownish-black iron has a grainy and glossy appearance to it. Lamination folds are very apparent on the surface of the tsuba as well as on the walls of the sukashi and kozuka and nakago hitsu-ana. The rim shows a fine granular concave tekkotsu (i.e. iron bones) as well. The size of the tsuba is large if it is a Yagyu tsuba at 7.