Probably not kiyomaro

[lonely panet]

Minamoto Kiyomaro Monshita Highest Rank Craftsman Nobuhide Kurihara Nobuhide Outstanding Dagger Special Precious Sword Certificate New Sword Upper Work Superb Edo Period > Sword Ken Sword Masao Yamaura Natsuo Kano | Jauce Shopping Service | Yahoo Japan Auctions. eBay Japan

 

nice looking tanto, good hataraki but who would have done it?? a student,  a faked mei,  

[Rivkin]

That looks like Fukuoka modern fake with yakuza papers.

As is often the case, the man who faked Kiyomaro did not have the skill to produce varied nie crystals including of relatively large size. Therefore his hamon despite having nie looks very much "blue" even when the light is almost above the blade. If the light is on a side of the blade nie hamon is supposed to look blue-grey, but when it moves above the blade its supposed to sparkle white. It does not happen with Ikkansai Yoshihiro and quite a few others from late shinshinto to early gendai who tried to make Soshu blades with apparently relaxed hardening conditions.

[Jacques]

 

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As is often the case, the man who faked Kiyomaro

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Tanto is signed Nobuhide 信秀 however very problably gimai