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Nakago and mei
The signatures on record in the museums are 河内守本行 (Kawachi no Kami Motoyuki) and 刀作人河内守源本行 (tōsakunin Kawachi no Kami Minamoto Motoyuki): the title, sometimes the Minamoto lineage (源, Minamoto) and the word that declares him a swordsmith.
Tsuba
The tsuba in the Tokyo National Museum is round, of iron, and bears an ox, a pine and chrysanthemums engraved in line, the 筋彫 (sujibori) technique. The one in the Edo-Tokyo Museum bears a wood-grain pattern, 杢目文 (mokume-mon).
Kantei keys
None of the sources consulted describes his jihada, his hamon, his bōshi or the shape of his tangs.
Details
Round iron tsuba engraved in line, 丸形筋彫鉄鐔 (marugata sujibori tetsu tsuba), signed 河内守本行 (Kawachi no Kami Motoyuki). Tokyo National Museum. Tokyo National Museum, via ColBase · ColBase terms of use · source 
The same tsuba, from the other side. Tokyo National Museum, via ColBase · ColBase terms of use · source