Commercially available tenkara-kebari’s earliest kebari
Things I was looking for Found. @dwalker Thank you
Commercially available kebari which seems to have been sold in the mid 1800’s
Peacock is rare in Japan though
Kebari has been using a peacock body for a long time
It was a solution of my doubt
蜂・頭毛鉤, bee - head kebari ??
This seems to be a modified version. Well, at least it has a similar name. Though not an old pattern like the one Todoroki-san uploaded.
蜂・頭（改）細蜂, bee head (modified ) thin bee
http://yoshidakebari.jugem.jp/?eid=1390
孔雀胴蜂頭（ハチガシラ）の作り方, Peacock Bee Head (Hachi Gashira) how to make
http://yoshidakebari.jugem.jp/?eid=1379
蜂頭毛鉤 are also mentioned twice on this webpage
Origins of Kebari - Origins of Ayu kehari
From the above website
Ayukehari (Gijibari) chronology
Ayu kehari started in the Edo period and were made with various names until now.
Shellfish (Egashira)
· Rapeseed needle (licking)
· Mosquito head (Kakashira)
· Bee Head (Hachigashira)
· Mosquito needle (spider)
· Mosquito net (Kakagi)
· Hair needle (Kakenbari)
It was called.
[sorry, I did not take the time to fix some obvious screwy translations of the above terms]
Thank you @dwalker I would like to thank you very much.
All the introductions so far were guesswork and imagination
The wonderful thing about this discovery is that there was a picture in the commercial brochure in 1929
I have an explanation for that kebari
It may be the origin of tenkara-kebari
Postscript
I have contacted this website
We will introduce the commercial pamphlet kebari in the future
Let’s enjoy what kind of kebari can be seen together
Well, you’re welcome. I am pleased you have found it interesting.
However, I think it is something that may have more significance than I understand.
And have failed to recognize what I have stumbled upon. Just by looking around.
And I am a bit confused by, "It may be the origin of tenkara-kebari"
Do you mean the origin of kebari commercially sold and called - tenkara kebari - for the first time? Or something else?
I had the understanding that the same kind of kebari had been in use for hundreds of years.
And during those earlier times have only been called kebari fishing (毛鉤釣り), or been called some other name in different mountain valleys. And not widely called or known as - tenkara fishing or tenkara kebari. Just as different mountain valleys tied unique kebari patterns. Probably popular patterns made popular by a local skilled fisherman, and remained unique to the area in past times when people did not travel far from their home village or mountain valley.
And it was only sometime during the mid 20th century when the name “tenkara fishing” (テンカラ釣り) began to be widely used. Mostly due to popular writers or journalist making the name tenkara widely used. However, 1929 is an earlier date for the use of the name tenkara kebari that I have read about.
I look forward to reading what new information the people at the website provide to you.
And hope that the story can be clearly told in translation from Japanese into English.
This kebari-pattern appears in the literature of 1834
It is the first form sold for mountain stream fish
There were various kebari in various places before that
It is a thing for the individual, but it is understood only by imagination when it becomes now
I think that it was commercialized since the pattern from long ago is effective
It is the beginning of Japan kebari’s standard
Let’s enjoy together what kind of kebari was used before called tenkara-kebari
Thank you for the explanation. サンキュー .
It is the beginning of peacock myth in Japanese kebari 
The more I look around on - The World of Nagara River and Gujo Rod [長良川と郡上竿の世界] blog. The more I find interesting things to look at, and try to read.
Last evening I was looking at a series of 7 blog post about tenkara horse tail hair fishing lines.
テンカラ馬素の話, Story of Tenkara Horse Element.
[the kanji 素 is a bit difficult to translate. However, this phrase, 素材 , using the same kanji will translate as “raw material”. I think 素 basically means an unprocessed material. aka 馬の尻尾毛, horse’s butt tail hair]
The blog is ranked 11th of 57 “tenkara fishing blogs” on blogmura (= blog ring, I guess).
Here is the 長良川と郡上竿の世界 blog profile on blogmura.
(links to various blog post are at the bottom of the page):
https://www.blogmura.com/profile/01455932.html
The link to the blogmura ranking list for “tenkara fishing” blogs:
https://fishing.blogmura.com/tenkaraduri/ranking.html
[Note for those not familiar with blogmura - if you look at the blue text at the bottom, below]
釣りブログ カテゴリー(16154人) / あいうえお順
[Fishing blog category (16154 people) / alphabetical order]
You can find links to other blogmura blog categories, such as:
源流釣り(27) Headwaters fishing (27 blogs)
渓流釣り(345) Keiryū fishing (345)
釣具（個人）（１４４）Fishing Tackle (individual) (144)
海外釣行記(87) Overseas Fishing Reports (87).
Even if you cannot read Japanese very well, they are easy to figure out if you know romaji. Just mouse over the blog category link names, the URL name will provide a guide to the what that blog category is about. 
What is the material for the eyes of the Peacock Bee Head (Hachi Gashira) ? Thank you!
JJ, sorry for delayed reply. I have been at our family camp, were I have no internet connection at the house, only available at the local library when it is open, otherwise I have to drive 25 miles or so.
Anyway, I am assuming you are referring to the yoshidakebari blog post - 孔雀胴蜂頭（ハチガシラ）の作り方.
I have never used them, but have seen them referred to by different names - such as - fly dumbell eyes, barbell eyes, hourglass eyes, double pupil eyes, and other names.
They seem to be available made from plastic or metal.
Do an internet search for - fly tying dumbell eyes.
Here are two links from search results.
https://www.caddisflyshop.com/fly-tying-beads–cones–eyes.html
https://www.youtube.com/watch?v=BAnbJE_md0Q
Good luck, gotta go, library is closing.
These are the two most common names I’ve seen them called as well. Most online fly tying suppliers sell them and many local shops do too.
Kind of an interesting video comparing fly movement when the dumbell eyes are tied on above or below the hook shank.