Gimei or authentic?

[Jonas Ne]

I purchased this tanto purely for the blade. But it had a mei and I was wondering if the mei was authentic or not. I tried researching the smith which appears to be Nobuyoshi. But I couldnt find any signatures on tanto. I searched the sword smith index for Nobuyoshi and found a few smiths that signed Nobuyoshi but no photo examples. Anyways, wondering if you all had any opinions on its authenticity! Thanks so much again. 

[Rivkin]

It looks like lower grade shinshinto in mino style.