From the photos provided, all I am willing to say is that it is a genuine Japanese sword. Looks like a Kaeritsuno was removed from the saya(??). I sent you a link that explains what is needed in order to receive the best information, but is seems you have not taken the time to read it. Or not followed it, as you have not provided a bare sword full length photo, nor a shot of the kissaki (tip), nor a shot of the entire nakago(tang). If you want help with it you need to supply the requested photos.