Ah yes, I am referring to the mei on the kozuka.
From an earlier post I found, (https://www.militaria.co.za/nmb/topic/39469-yamashiro-daij%C5%8D-minamoto-kunishige/)
There were two Yamashiro-Daijō Kunishige, the father and the son.
The 国 was what concerned me the most on the mei though I was able to find some results associated with the son.
I found a piece that seems to have similar koshirae.
https://www.e-sword....1110_2002syousai.htm
I have added a photo of the nakago and a couple photos of the kissaki.
I will see what I can do about the hada.
Now that I've gotten some closer images, I can see the roughness.
Is there a post I can be pointed to for proper cleaning and care or should professional assistance be looked at?