I am talking about value/investment
After Nambkucho, period was peaceful for a few decades, you can easily find swords dated and signed, During sue Muromachi probably Hundred thousands were forged, no problem to find typical signed blades by listed smith. Get away from the charecteristic from a given school and the blade will lose money.
I don't even talk about Shinto, shin-Shinto.
Now, it is very easy to verify, go to Dr Stein's commercial site and check the prices
what is worth a Tamba no kami Yoshimichi wakizashi unsigned and not in Sudareba??
Now, why papered? because I don't speak Japanese, I am not amei specialist and I don't want to buy a Gimei blade. I buy/pay a mei, only if certified