Interesting thought.... but still if you want the NTBHK's opinion on who made it or its value you still are in the realm of appreciation, rather than science...
I myself normally step into my time machine, visit ancient Japan, and go looking for the smith who apparently signed the sword.. when i find him i ask in my best classical Japanese wether he made it or not, and wether or not he wants to give me some proof in writing.
Afterwards I travel to present day Japan, and go to the spot where the specific smith has left me his letter of appreciation, in a sealed container. I dig it up, or get it out of the cave or wherever we decided to hide it, and take the sword, and its papers to the NTBHK.
That normally does it... and since there is no kiri sutei gomen anymore, a negative appreciation regularly has no consequences for the appraiser....
:lol: :lol: :lol: :lol: :lol:
would this story have anything to do with me being Dutch and living near Amsterdam? I wonder.......
KM