Jacques

Sorry, but I don't practice the art of divination. The hamon seems to be based on notare which is a characteristic of Soshu den but I can't say more. We should know if the hamon is in nie deki or not what the size of the nie is, what the structure of the hada is etc.

Hum https://www.swordsofnorthshire.com/products/hand-forged-high-quality-chinese-tamahagane-clay-tempered-samurai-katana-sword

I will be very clear, it's impossible to determine the age of a sword without having it in hands. To my eyes it's a fake...

This lineage from Markus is more detailed

The link between Tomoshige and the Rai school has never been established, and this theory is not recognized.

eBay.... I never bought a sword without having it in hands....

An exemple to share ? Kasane is always mesured to the mune.

Yamato den = high shinogi

Obiously gimei https://www.samuraimuseum.jp/shop/product/antique-Japanese-sword-wakizashi-signed-by-mino-no-kami-jyumyo-nbthk-hozon-certificate/?srsltid=AfmBOooramjpL2uGeOLrUD0P28RwlYDsa4aUalfgD_SBsxJpnjvUi4dq

https://www.seiyudo.com/ka-020523.htm

NIdai Nobutaka

From Markus index of Japanese swordsmiths (Nihonto meikan translation) Kaneiwa (兼岩), Bunmei (文明, 1469-1487), Mino – „Kaneiwa“ (兼岩), „Nōshū Seki-jūnin Kaneiwa“ (濃州関住人兼岩) Kaneiwa (兼岩), Eishō (永正, 1504-1521), Mino – „Kaneiwa“ (兼岩), „Nōshū Seki-jūnin Kaneiwa“ (濃州関住人兼岩) Kaneiwa (兼岩), Eiroku (永禄, 1558-1570), Mino – „Kaneiwa“ (兼岩), „Nōshū Seki-jūnin Kaneiwa“ (濃州関住人兼岩), gunome-midare in nioi-deki or nie-loaden ō-gunome-midare to hitatsura Kaneiwa (兼岩), Tenshō (天正, 1573-1592), Mino/Kaga – „Kaneiwa“ (兼岩), „Nōshū Seki-jūnin Kaneiwa“ (濃州関住人兼岩), this Kaneiwa moved later in his career to Kaga province Kaneiwa (兼岩), Genroku (元禄, 1688-1704), Mino – „Kaneiwa“ (兼岩), „Nōshū Seki-jūnin Kaneiwa“ (濃州関住人兼岩)

According the Nihonto meikan Nagatsuna never signed Awataguchi Nagatsuna 粟田口長綱, I would think it's gimei..

Worth reading https://www.nittetsukou.co.jp/eng/karematuzawa/2.html

Slightly erroneous: sand iron is not suitable for blast furnaces, so ore must be imported. The tatara will continue to operate alongside the blast furnaces.