This one is a definite crap shoot! But the OP seems hell bent on it, I have seen it here, SFI, and FB, looking for positive recognition.
Edit: Quick thought , maybe he is the seller, not an interested party seeking advise ????
Here is my post from SFI:
Both the e-bay write-up and the one in the photograph state that there are "Fukure". One states "much Fukure", but I wonder if he meant Fumbari ??
The write up from Japanese swords ltd., states minor shinogi ware/fukure" and "2 long Mune ware/fukure" Long
mune ware/fukure are flaws and not a good thing.
While mentioned (
if you know the terminology), these flaws are not shown anywhere in the photos (1st red flag).
Another flag in my opinion is in the write up it states that it wasnt sent to shinsa for papers. Not to say that this is not true, but perhaps it was never sent by the seller. Considering that IMHO there is a fairly high probability that the signature is gimei (Forgery), could be another reason it has no papers. It could have failed shinsa in the past or perhaps someone recognized the possibility that it would fail if submitted today.
My opinion of there being a good probability of gimei is not without rationale. First, in my opinion it is poorly cut and just doesnt feel right. Secondly and perhaps most importantly, I could not find one example of these smiths signing as the one in question is signed, Hoshu Takada Ju Tiara Nagamori, nor did most, if any use this mori character 守.
The Bizen Nagamori smiths used that Kanji character much more extensively; Bishū Osafune Nagamori 備州長船長守
And while there are some Bungo smiths listed as using this mori character 守, I could not find any examples:
平長守 Taira Nagamori
永守作 Nagamori Saku
Most Oshigata I found showed the use of this mori character 盛. The highest rated Bungo Nagamori (20pts), the first generation, used this character, as did the second and third.
豊州平長盛 Hōshū Taira Nagamori
豊後高田住永盛 Bungo Takata ju Nagamori
豊後國高田住平永盛作 Bungo Kuni Takata Ju Taira Nagamori Saku
As well, several Bungo smiths from the same time period, signed using different Kanji for both the Naga and Mori characters:
永盛作 Nagamori Saku
Perhaps someone else can find and provide additional information and/or an oshigata of one signed exactly as the one in question, but I could not.
Now, I do not claim to be an expert, which is why I would would never make a claim as absolute. And I am not even in the same ball park as the Shinsa Teams.
However, there are too many discrepancies on this one.
This is merely my opinion, it and $5 will get you a coffee most places.