Nobody

伊与住 - Iyo ju 正阿弥家正 - Shoami Iemasa (unsure about the last kanji)

The third tsuba, 八幡太郎鳩丸 – Hachiman Taro Hatomaru 御太刀鍔 – On-Tachi tsuba (tsuba for a tachi)

OK, let's agree to disagree. I simply think that there are little bases to say something.

You might misunderstand another point. Mitsuhashi is one of families uses the mon (丸に三文字). But it does not mean that all Mitsuhashi families use the same mon. According to the linked page, a representative mon used by Mitsuhashi family is 兎紋 (Usagi-mon). Ref. 【兎】兎紋一覧（うさぎ）：家紋のいろは (irohakamon.com) Family crests and family names are many-to-many relationships. We do not know the mon Mitsuhashi Toranosuke used.

As far as I know, 1. The mon is used MANY families. And most of them do not have “三” in their family names. Mitsuhashi family is only one of them. 2. As I said before, I do not think that Mitsutachibana is a family name. 3. I do not know why Hawley write 三橘 there. Only a typo? IMO, I do not understand why we must stick to Mitsuhashi name in this situation.

三橘 (Mitsutachibana) is an improbable family name. But there is a family crest whose name is Mitsutachibana. Ref. 三つ橘紋（みつたちばな）：家紋のいろは (irohakamon.com)

関住不破兼若作 – Seki ju Fuwa Kanewaka saku And you should take clear pictures for its date.

This is only my guess. 君命重夳(=泰)山 – The order of my load is heavy as Mount Tai.

Frankly, I have doubts about your theory. Just to confirm, the second picture is saying that the crest is used by Fujikake and Mitsuhashi families? I found that the crest is used by more than 50 families. BTW, 三橘 does not read Mitsuhashi but Mitsutachibana. Ref. 丸に三文字紋（まるにさんもじ）：家紋のいろは (irohakamon.com) Is the mark in the first picture really a family crest? That might be a trademark of a shop or mere memo. Trademarks and family crests are different. I do not think that a shop owner uses his private family crest as the shop’s trademark. The mark in the first picture and the crest in the second picture look different to me. Therefore, there is no evidence that Mitsuhashi Toranosuke has something to do with the mark or the gunto you have.

My guess, That is an auction market regularly held mainly by dealers.

Ref. Jōkyō - Wikipedia

於備前國義光作之 - In Bizen no kuni, Yoshimitsu made this.

I only have a kogatana made by the smith.

I am unsure about the first kanji. 國廣 - Kunihiro

It reminds me of a physical education class in my university. I learned Kyudo (Heki-ryu Insai-ha - 日置流印西派) for one year.

北支二二 – Hokushi 22 兄さん – Elder brother Ref. Japanese North China Area Army - Wikipedia

The smith name might be Munekage. 豊州高田住藤原統景

My guess; 播州姫路住森田屑影作 – Banshu Himeji ju Morita Kiyokage saku

Line 1: 同窓会記念寫眞 Alumni reunion, commemorative photo Line 2: 北山国民学校を卒業三年・・・ Three years (after) graduation from Kitayama elementary school Line 3: 昭和拾九年▢・・・ Showa 19th year (1944) Line 4: 池田先生 Mr. (or Ms.) Ikeda (teacher) Line 5: 当時拾七才の我輩なり I was 17 years old at that time.

One correction, Honami’s writing is not gold inlay (金象嵌銘), but Kinpunmei (金粉銘).

The seller says that the paper was issued by 日本刀剣保存会 - Nihon Token Hozonkai (NTHK). That is not NBTHK.

I think that the name is 鈴木茂 - Suzuki Shigeru.

Yes, I think so.

千葉介　平信▢所持之 – Chiba-no-suke Taira Nobu▢ Kore o shojisu (carry this)

The mei is not Sadakatsu (貞勝), but Sadakazu (貞一). Btw, he died in the year (1918).