...And here is the Aioi's answer, not exactly what I asked but it is an answer! :D
Quote :
Dear Mr. Bruno HERRMANN san.
My customer submit the blade to NTHK shinsa recently and got the paper.
I think the blade is called Hantanren sword.
The blade was polished nicely.(polishing cost will be ¥80,000)
The blade also accompanied with Gunto Koshirae.
Even if the blade is a consignment sale, we will buy back 70% of the sales price at anytime.
Recently army Gunto sword which is hantanren or mutanrento sword, price is higher than before.
It means army gunto is treated as precious historical sword.
I think NTHK issue the certificate as historical sword even if the blade is Hantanren sword.
We attach the certificate.
Recently a lot of Japanese swords are exported to foreign countries.
I think this tendency will be increasing.
Japanese swords are treated as investment.
Unfortunately Japanese people are not interested in Japanese swords, many visitors visit Japanese sword museum
and also ever growing sword expert like you.
After 15 years later, good or bad Japanese swords will be exported to foreign countries like wood block printing or Netsuke while Japanese
people are sleeping!
Would you please understand this situation.
kind regards.
Kazushige Tsuruta