Kenukigata Tachi which has same steel in Tsuka (handle) and the body of blade, and Kogarasumaru sword which is warped with Kissaki-moroha zukuri (double-edged point style) were in a transition period of the change mentioned above (Kogarasumaru was mentioned in an ancient document as a work of 'Amakuni,' a sword craftsman in the early 8th century, but it is widely believed that it was in fact made in the mid Heian era.).
以上の変化の過渡期にあたるのが柄が刀身と共鉄の毛抜形太刀や、鋒両刃（きっさきもろは）造りで反りのある小烏丸（こがらすまる）である（小烏丸は古伝書には大宝(日本)年間（8世紀初頭）の刀工「天国(人物)」（あまくに）の作とあるが、実際の制作は平安中期と見るのが定説となっている）。