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i'm not sure it's the same guy tho

If it can help, after a quick research i found a company registered in the UK with the name "KOKUSAI NIHON KACHU BUGU SHINKO KYOKAI LIMITED" here https://www.companysearchesmadesimple.com/company/uk/14572429/kokusai-nihon-kachu-bugu-shinko-kyokai-limited/ As you can see there's also the following address : 10 John Street STRATFORD-UPON-AVON CV37 6UB Which is a building owned by https://leighgraham.co.uk/ So you might question them about it

Ito suguha with bo-utsuri on a Bizen tanto

HIDETOKI (秀辰), 2nd gen., Enpō (延宝, 1673-1681), Musashi – “Hitachi no Kami Hidetoki” (常陸守秀辰), “Yamashiro no Kami Fujiwara Hidetoki” (山城守藤原秀辰), “Hidetoki” (秀辰), first name Zen´emon (善右衛門), he later took over the first name Gonbei (権兵衛), according to a theory he was the son of Ōmi no Kami Fujiwara Kiyoshige (近江守藤原清重), he moved later in his career from Ōsaka to Edo

it looks like 包派 but can't find any swordsmith with that name

But kageuchi are not signed in the same way as the commisioned sword, more likely there was multiple individuals that had to recieve a sword in the same family, that would make sense with the company i found with the same name, probably all (male) family members got one

Congratulations on the great find, i see nothing in the signature that makes me think it might be gimei. About the date on the swords, we shouldn't take the date inscribed on the sword as the actual day it was made, many times the date inscribed might represent something specific, only the year should be taken in consideration. A good example of that is how many Bizen swords were dated "August", they either work only one month or most likely because the number "8" is considered the luckiest number. So in this case maybe that date might represent something for the family (i'm having a mamori tanto made with the date of birth of my son inscribed) or just they were made for several members of the family so none of them can say it got the first one. Regarding the family you might try investigate on this https://www.kimuraya-sohonten.co.jp/ayumi, they're one of the first baker society of Japan and presented their products to the Emperor, so there's a good chance these blades used to belong to them.

Interesting question, the answer is not that easy but for sure they appeared quite early, as can be seen from the following example from Sasano's book on early fittings It seems they're around since koshigatana were in fashion, you'll probably won't find tsuba with kogai and kozuka ana before Nanbokucho period though as the use of uchigatana instead of koshigatana became popular in that period. Here you can see an example of koshigatana koshirae with details of kozuka and kogai from Nanbokucho period https://bunka.nii.ac.jp/heritages/detail/553930

I recently bought a nice wakizashi with an unusual couple of bonji engraved on the nakago, but i can't recognize either of them, right one might be a script version of "monju", but the left one i have no clue. Anyone can help?

Chrisptophe's departure was sudden and unexpected, he was a very nice person. He will be sorely missed

i think the beginning is 伊奈波 Inaba, can't figure out the middle part, end is 兼利作 Kanetoshi saku

You need to take pics in different angles and different source of light in order to capture most of the features of a sword, some example of pics i took on a modern made tachi

菊一文字 Kiku ichimonji

元治之子四月日 Should be "first year of Genji a day of 4th month" (april 1864)

Thank you! Glad you enjoyed my article and tsuba, you have a fine example as well

seems the answer was already here 🙂

Might mean in chinese "Beginning (始) of Zhou (周) Dynasty" Tho would mean that's a really old guard

It was up for sale before, it's in good conditions and from the same maker, hard to tell if was born as daisho but it's a nice set nonetheless

Maybe they were shipped to Osaka freshly made and got damaged in the trip Seems that school only worked on iron

Yes, there's another one as well from same school but both have some corrosion problem unfortunately. Seems that saying about corrosion is real

Thank you, i read somewhere these are quite prone to corrosion, so it's always good to find a well preserved one

Indeed it is, in hand is even better cause you can appreciate the precision and depth of the engraving even more

I saw those as well, the Bonhams one someone made a great score. The second one is badly corroded, last kanji is hardly readable so they made a guess i think, but to me should be the late Edo Tomohisa (same as the published one in my article)

Thank you Dale, i actually know those but i deliberately excluded cause not signed. Actually i have other signed examples but since the workmanship and subject are the same i thought no need to include those.

Recently i made a research on the subject depicted on the following tsuba made by Yaji Tomoyuki (八道友之) that i currently own, since i thought it was quite interesting what i found i made an article about it. Feel free to download it and i'd be happy to hear your thoughts about it. Chōshū Yaji research.pdf