What is Daisho and why we are "wrong" - open discussion.

[SteveM]

9 hours ago, Promo said:

what does NBTHK require to paper two blades - without koshirae - as Daisho.

 

In the case of the Naotane, and in the case of Guido's swords, the pair were signed and dated with the same date, indicating they were made with the intention/expectation of them being used as daisho. Having consecutive registration numbers is probably another strong factor. I think these two things are the main criteria for the NBTHK, although Guido also mentions they should have the same features (the deki).

 

 

[Jacques]

https://sword-auction.com/en/product/15489/as22593-大小：延寿宣次作保存刀剣）/