What's considered as acceptable?

[Babu]

I have a koto sword that has been cut down so many times the Nakago is all ex blade material and still possess four mekugi-ana. 

It's a bit shiny looking although it's got a version of yasureme albeit not very tidy. 

I wondered if it was perfectly acceptable for a sword so adapted in the past that it's nakago was still quite "shiny."

I don't want to repatinate it but I'm wondering what's the norm when faced with this type of Nakago. 

Thank you Adam 

[Dave R]

To the best of my knowledge, you treat it as you would any clean nakago. Do nothing apart from normal maintenance. The patina or lack of same is an indication of when the job was done. Repatination is done  because some event removed the patina formerly there, faking patination is just that, faking with intent to decieve.

[ROKUJURO]

To my eye this looks as if there had been a thin patina (but not a lot of corrosion) that was "cleaned". YASURIME lets me think of KOTO.