?Legit JuBi at auction

[JeanEB]

I don't think I've really seen this before on auction sites, but this is supposedly a JuBi Ko-Bizen Masatsune. 

For the members that have been here for far longer than I have and are far more knowledgeable, is this legit? How often are Jubi certificates faked?

 

https://www.jauce.com/auction/q1183787086

[Lewis B]

Seller also has a bridge for sale. Jubi papers are extremely suspicious and look to be easy to fake.

 

Worth reading this

 

[Jussi Ekholm]

I own the Jūyō Bijutsuhin Book collection. This Masatsune tachi is not among the 1094 items in the books.

 

Also I think they made an error on the paper that is fairly easy to check. The paper of Yahoo Auction sword seems to have Shōwa date 昭和十六年八月二十一日. However when you check all the items in the book, the Shōwa 16 dates were 四月九日 & 九月二十四日

 

There are actually 11 signed tachi by Ko-Bizen Masatsune that are Jūyō Bijutsuhin. 2 of them actually passed on Shōwa 16 but they are completely different tachi to one being sold.

[Gakusee]

Gentlemen:what about something simpler…… like the mei is on the ‘wrong’ side of the tang for Ko-Bizen Masatsune….

[JeanEB]

Thank you gents for the response, 

Lewis thanks for the article, I hadn't seen it before but very informative. Jussi your access to the book collections is always appreciated, thanks for taking the time and effort to check!

As it was my first time seeing "Jubi" at auction I will admit I was a bit surprised, and as a result, naive

[Jussi Ekholm]

Some of the top end Japanese dealers do occasionally have real Jūyō Bijutsuhin blades in their inventory. However I think often they are not advertised that much in public, they buyers might respect privacy and the shops know their clients. I don't really visit swords shops in Japan as I can't buy anything at the moment. I still remember first time going into Iida Koendo many years ago and they had JūBi at their shop that they hadn't even listed on their website.