Nobody

備州三原住貝正久 - Bishu Mihara ju Kai Masahisa

2. 加州金澤住炭宮作之亟兼則(花押) – Kashu Kanazawa ju Sumimiya Sakunojo Kanenori (Kao) 貞享三年八月吉日　以南楽(wrong kanji → should be 蠻)鉄造之 – Jokyo 3rd year (1686), 8th month, a lucky day, Made this from nanban tetsu. [not written on the paper] 二ツ胴落 – Cut two bodies.

I would say 関住兼定 - Seki ju Kanesada.

大湊防備隊　五 – Ominato Coastal Defense Group 5 一水　松平伊之助 - 一水 (1st Torpedo Squadron?)　Matsudaira Inosuke

If it is a phrase from The Last Samurai, corresponding natural Japanese may be “完璧な花にはなかなか出会えない。”. As it is a colloquial style, it can not be written in kanji only. You can express it with kanji in Chinese (or Classical Chinese?). Anyway, I agree with Jean C.

越前國継 - Echizen Kunitsugu

越前住 - Echizen ju 播磨大掾藤原重高 - Harima daijo Fujiwara Shigetaka

天照山鍛錬場作 - Tenshozan tanrenjo saku 昭和十七年四月吉日 - Showa 17th year, a lucky day in the 4th month

Not 30cm but 15cm.

関一文字 - Seki Icimonji

The sword in question in Yao city museum Ref. 八尾市立歴史民俗資料館｜収蔵品 (plala.or.jp) Found at Otakenishi Remains (stratum of 2000 years ago).

錦繍前程 – Splendid prospect I believe that the item is Chinese.

“Noshu Seki ju” means “Living in Seki of Noshu". 濃州 (Noshu) = 美濃国 (Mino no Kuni = Mino province). Present Seki city in Gifu prefecture Ref. Seki, Gifu - Wikipedia

在銘 – Zaimei (signed) 濃州関住飛騨守氏房 – Noshu Seki ju Hida no kami Ujifusa 長サ壱尺三寸 – Length; 1-shaku 3-sun BTW, the actual mei on the nakago is 飛騨守藤原氏房 – Hida no kami Fujiwara Ujifusa .

Kenmu 3 = 1336

There is another type of Hoko. Thay are more like straight blade. Ref. 矛 - Wikipedia

濃州関武山義尚作 – Noshu Seki Takeyama Yoshinao saku

I am afraid that the sword is fake. I hope you did not pay too much.

The dates on the paper are 1. Hole-punched – 22201005 (Heisei 22, 2010/05) 2. Front side - 平成二十二年七月二日 (July 2, 2010) 3. Back side - 平成二十二年八月二十七日 (August 27, 2010) As for the dates, I understand as follows, 1. The date means the year and month when the sword was accepted for examination. 2. The date of judgment 3. The actual date when the paper was issued

昭和丁未年卯月日 - Showa year of Hinoto-Hitsuji, Uzuki　(1967/04)

I found that the sword was excavated at Otake-nishi Renains in Yao city. The sword was found at the 3rd excavation (1996-1997) and documented in a report in 2008. It is the first sword which was recognized as a cast iron sword in the area. Ref. 大竹西遺跡 - Comprehensive Database of Archaeological Site Reports Japan (nabunken.go.jp) Also an archaeologist studying on iron cast in ancient Japan mentioned the sword in his paper (in Japanese). Ref. KAKEN23520946_Nojima.pdf (hiroshima-u.ac.jp)

Yes Steve, most of the points you pointed out are correct. But I believe that also the blank format is fake. I do not want to help forgers, so I am not going to show details here. But there are more than five suspicious points in the format. And all stamps are fake. The characters in the embossed stamp are “財団法人　日本美術刀剣保存協会” (NBTHK). The characters in the larger stamp in the remarks column are “貴重刀剣之證” (a proof to be a kicho-token). How stupid such stamps are on a torokusho. The bottom left stamp, which is a seal of 大阪府教育委員会 (Osaka Prefectural Board of Education), uses different font comparing to the legitimate seal.

I guess that the lost name is 輝行 (Teruyuki). Ref. Bungo ju Fujiwara Teruyuki 日本刀・豊後住藤原輝行｜日本刀・刀剣 販売専門店･東京【十拳】 (tokka.biz)

From someone's twitter,

I believe that the torokusho is also fake. That contains many suspicious points.