Personal opinion only, the sword has been meddled with quite some. The nakago seems acid damaged (like someone tried really hard to artificial age it) then there is the chance the yasurime were added aggressively before that and an old mei removed for a gimei. Nakago looks shinshinto or later ( forgive me for not being able to read mei, yet)
As said, it's your money , depends on the threshold and why you want it or what you hope you will gain from it