Antique Japanese Sword Katana Signed by Chounsai Koretoshi with Tokubetsu Hozon Certificate
【Description】
This blade was signed by Chounsai Koretoshi (長運斎是俊) in the 2nd year of the Bunkyu era (1862: Late Edo period) in Toto (東都: Edo city). The back of the tang says that this blade was owned by Kakimoto Moritada (垣本盛任). Koretoshi was the second son of the renowned first-generation Chounsai Tsunatoshi (長運斎綱俊), who was widely recognized as a genius swordsmith of the Bizen-den tradition during the Shinshinto period in Edo. Koretoshi was a disciple of Suishinshi Masahide (水心子正秀). His real name was Kato Sukeichiro. Initially, he signed his works as Koretoshi (是寿), later changing his name to Koretoshi (是俊) while the pronunciation was the same between the two names.
After his father Tsunatoshi passed away, he officially inherited the name of the second-generation Tsunatoshi in 1856. Therefore, this sword was created just before he assumed the name “Tsunatoshi.”
Koretoshi served as an official swordsmith for the Ito clan of Hyuga. Among his disciples was Koyama Munetsugu, and his brother, Ishido Unju Korekazu, who was an official swordsmith for the Tokugawa shogunate. He played a significant role as the head swordsmith of a major school.
About the First-Generation Chounsai Tsunatoshi
The first-generation Chounsai Tsunatoshi was born in 1798 in Yonezawa, Hashu Province (modern-day Yonezawa City, Yamagata Prefecture). His father was Izumi no Kami Kunihide. Born into the Kato family, he was the younger brother of Kato Tsunahide. His real name was Kato Hachiro.
Tsunatoshi served Yonezawa Uesugi clan, a powerful feudal lord in today’s Yamagata prefecture. During his early career, he moved to Edo city to learn superb sword-forging techniques from Suishinshi Masahide, one of the most renowned swordsmiths at the end of the Edo period. There is also a record of him forging swords in Osaka and Kumamoto while his base was in Azabu town in Edo city (today’s Tokyo).
He settled in Edo city around 1823, and he created most of his work. He started to run his school there and resided in the house of Uesugi family. It is said that he received a stipend from them. He received the honorable title Chounsai (長運斎) in the first year of the Bunka era (1804). And, he gave this title to his son Koretoshi (the second-gen Tsunatoshi) in 1856, and he got the new title Chojyusai (長寿斎). Chojyu means living a long life in Japanese.
The school Tsunatoshi belonged to flourished at the end of the Edo period, training many swordsmiths who later became historically significant ones, such as Koyama Munetsugu, Takahashi Naganobu, Ishido Korekazu. Tsunatoshi excelled at forging Bizen-Den tradition swords with Choji Midare Hamon, an irregular, wavy tempering line. Most of Tsunatoshi’s work reflects Bizen Den (One of the Five Japanese sword-forging traditions). In terms of Bizen Den tradition swords, it is said that Tsunatoshi school surpassed Suishinshi Masahide school.
Tsunatoshi died at the age of 66 in December 1863 after creating many great swords for high-class Samurais in Edo city. He is categorized as one of the top-tier swordsmiths during the late Edo period (SHIN SHIN TO era). And, he was the head of the prosperous school at the end of the Edo period. You can see excellent craftsmanship Koretoshi inherited from his father in this Katana.
It is appraised as a Tokubetsu Hozon Token (特別保存刀剣) issued by NBTHK (Nihon Bijutsu Touken Hozon Kyokai:日本美術刀剣保存協会). This authentication paper was only given to authentic Japanese swords, especially well preserved and high quality with artistic value.
*Please keep in mind that there are a couple of Kitae Kizu on the Mune (backbone) of the blade. If you like to see the detailed condition, please feel free to contact us.
【Blade】
Cutting Edge Length(Nagasa):75.8 cm (29.8 inches)
Curvature(Sori):1.5 cm (0.59 inches)
Hamon:
The crystalline structure which forms along the cutting edge of a blade as a result of the hardening process
Jimon(Jihada):
visible steel surface pattern created by folding and hammering during forging process
Kissaki:Kissaki is the tip of the Japanese sword.
Nakago:Nakago is the tang of the Japanese sword.
Japanese swordsmiths left the black rust on the tang because it prevents red rust while the tang is in its handle. And the discoloration of the tang was created over time, and it is a great indicator for a Japanese sword specialist to estimate when the sword was forged.
Koshirae:Koshirae is the mounting of the Japanese sword. There are several parts that consist of Koshirae such as Saya (Scabbard), Tsuka (Handle), Tsuba (Handguard).
Fuchi-Kashira:A pair of matching sword fittings that cover the upper and bottom parts of its sword hilt.
The design of this Fuchi Kashira (縁頭) features finely engraved leaf-like patterns. These patterns appear to represent pine needles or ferns (shida, 羊歯).
In Japan, pine trees (matsu, 松) are considered symbols of longevity and permanence, making them a popular auspicious motif often used in samurai sword fittings. As evergreens that retain their foliage even in winter, pines symbolize the unwavering spirit and loyalty of the samurai.
Tsuka and Menuki:Tsuka is the handle of the Japanese sword and Menuki is its decoration.
Tsuba and Habaki:Tsuba is the handguard for the Japanese Sword and Habaki is the equipment to make the blade not touch its scabbard inside. It prevents the blade from getting rusty and chipped.
The design on this tsuba features a scenic landscape with mountains, thatched-roof houses, a flowing river, and a small bird.
Thatched-roof houses (茅葺き屋根):These traditional houses, thatched-roof houses (茅葺き屋根), reflect the rural lifestyle of Edo-period Japan (1603–1868). Such homes were common in farming villages and evoke a nostalgic, peaceful atmosphere. The small bird, possibly a plover (千鳥, chidori), is a common motif in Japanese art. Plovers are known for their resilience against harsh coastal waves, symbolizing perseverance and strength—qualities highly valued by samurai.
The small gold inlays seen in the lower section add contrast to the dark iron surface, a technique often used by Edo-period craftsmen to enhance depth and visual appeal.
During the Edo period, samurai carried swords not only as weapons but also as status symbols. Tsuba were highly collectible, with some crafted by renowned artisans and presented as diplomatic gifts. This tsuba’s rustic landscape suggests that it may have belonged to a samurai who appreciated the beauty of nature and traditional Japanese values.
Saya:Saya is the scabbard for the Japanese sword.
This Saya is covered with black lacquer. Due to its high waterproof effect, lacquer has been used since ancient times in Asia. The blade of a Japanese sword is made of iron, and moisture is the greatest enemy of iron. For the purpose of carrying the blade without degrading it, people devised a method of coating the scabbard with lacquer. To prevent not only moisture but also rain and snow from penetrating the inside of the scabbard, it was necessary to apply multiple layers of lacquer. The Nushi (塗師, lacquerers) was born precisely because advanced techniques were required to handle the complicated processes.
Authentication Paper:NBTHK TOKUBETSU Hozon Certificate for the blade (No. 1022285)
NBTHK, also known as Nihon Bijutsu Touken Hozon Kyokai (the Society for the Preservation of the Japan Art Sword), is one of the oldest Japanese sword appraising organizations in modern-day Japan. They authenticated the blade on February 21st in the 6th year of Reiwa (2024). They appraised it as Tokubetsu Hozon Touken, the blade especially worth preserving for Japanese society. The purchaser will receive this original certificate as well. We can also translate what is written into English and make a PDF file for your record if you request.
Registration Number : Ehime 16688
The Board of Education in Ehime prefecture issued a registration paper for this sword. It is called Jyu Hou Token Rui Tourokusho (銃砲刀剣類登録証). Bunkacho (The Agency for Cultural Affairs) acknowledges a Japanese sword with this paper as a work of art.
The sword needs to be traditionally hand-forged and made of Tamahagane carbon steel to be registered in the system. With this paper, its owner in Japan can legally own an authentic Japanese sword. Based on this registration number, we will apply for its export permit.
This paper will need to be returned to the board of education when the sword is being shipped abroad, but you can receive a copy of it. An English translation of this registration paper is available on request.
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【About us】
Samurai Museum is located in Tokyo, Japan, exhibiting antique artifacts related to the Samurai history. Samurai Museum Shop is the place for those who are interested in Japanese culture and craftsmanship. We deal with antique Samurai swords/armor, traditional crafts made in Japan and so on.
【Japanese Sword& Export Process】
The Japanese swords we deal with are hand-forged edged swords made in Japan. It was made from the traditional carbon steel called TAMAHAGANE(玉鋼). Samurai Museum is familiar with the proper legal procedure for an antique/ authentic Japanese sword to be exported from Japan. We have sent more than 1000 Japanese swords for the past few years (~2025) to amazing owners who appreciate its historical value.
Each Japanese sword is registered under the Agency for Cultural Affairs and the Board of Education in Japan. They issue a registration paper for each Japanese sword for its owner in Japan to legally possess it. The Japanese sword with its registration paper means it was traditionally hand-forged in Japan.
To legally export the sword from Japan to other countries, we will have to apply for its permit to the Agency for Cultural Affairs(Bunkacho) and return the original registration paper to the Board of Education. It normally takes around 2-4 weeks to receive this permit after submitting required documents. And we would like you to expect at least 1-1.5 months for your order to arrive at your given address after you ordered. For more detailed info, please click here.
It is allowed for residents in Japan to own authentic Japanese swords without a special license as long as they come with registration papers. Please feel free to contact us if you are a resident of Japan, whether temporarily or permanently. We will also assist you when you leave Japan and need to obtain the export permit.
【Payment Method】
We accept payment through Stripe (Credit card), PayPal, Apple Pay or ChromePay, all of which are secure payment methods. Also, you don’t need to make an account on Stripe for the checkout. If you prefer other payment method, please contact us. After confirming your payment, we will apply for an export permit. You may either pay in JPY, USD, AUD, CAD,EUR CHF or GBP. The price is set in Japanese Yen. Prices in other currencies are automatically calculated based on the latest exchange rate.
* If the amount is above 1 million JPY, Stripe or wire transfer will be the only options for payment.
【Shipping】
We have shipped authentic Japanese swords to the USA, Canada, Mexico, Germany , Belgium, France, Finland, UK, Hong Kong, Australia. If you don’t live in these countries and like to order, please contact us first before making a purchase. We offer Free International Shipping as long as we can send antique Japanese swords by EMS.
We normally ship by EMS(Express Mail Service) provided by Japan Post. We will send you a tracking number for your order as soon as we hand it to the post office. We will put 100 % insurance on the shipping document without any extra charge. Based on the total amount, there might be a duty tax or other fee for you to pay, depending on the countries. We use package cushioning to protect the item and put it in a PVC pipe, which is one of the most secure packages because of its durability.
It will normally takes 5-14 days for the item to arrive at your given address after we dispatch it. Time of delivery is estimated as accurately as possible by the carrier but does not take into account any delays beyond our control such as by inclement weather, post office holiday seasons.
* If you live in Australia and like to purchase an authentic Japanese sword, please click here to know the detail.
* If you live in the UK and like to purchase an authentic Japanese sword, please contact us first and click here to know the detail.
【Review】
Here is one of the reviews we received from a customer who purchased an authentic Japanese sword from us. For more reviews, please click here.
“My experience overall with the whole process was wonderful. I had many questions about the history and process to purchase these treasures. All my questions were answered very timely and complete. The staff is very knowledgeable and very well versed if any questions do arise.”
【How to make sure the condition】
Please keep in mind that what you are going to purchase is an antique item. We uploaded high resolution photos for you to check its condition thoroughly. If you like to see more photos with different angles, please feel free to contact us. We will be happy to send them to you so that you can make informed decision. It is essential for us to know that you are happy with your choice of a sword. and we are prepared to use the best of our ability to serve you.
【How To Contact Us】
Please contact us through email, Facebook Messenger or Live Chat if you have any questions. You can find each icon on the right side of the website. Please click one of them to reach us. We will reply to you within 1-2 business days.
【The Art of Nihonto (Japanese Sword)】
Samurai’s history is a profound, eloquent legacy of ancient Japanese warriors in which millions of people worldwide are being fascinated. If you like to find out the art of Nihonto, please click here.
【A Guide to Japanese Sword Maintenance】
After acquiring an genuine Japanese sword, it is also important to know how to take good care of it. Here is the special video for you. Mr. Paul Martin, Japanese sword expert, shows you how to give proper maintenance to your sword. By mastering how to clean the Japanese sword, its aesthetic beauty will last forever.
When you purchase a Japanese sword from us, you can get a Free Japanese sword maintenance kit. It comes with four tools(Choji Oil, Uchiko Whetstone Powder, Peg remover, Oil Applicator). By watching the video instruction above , you can enjoy learning how to maintain your Japanese sword while appreciating it. If you have any difficulty assembling the sword or cleaning the blade, you can feel free to contact us.
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Thank you for reading all the information on the page. If you have any difficulty choosing the right Japanese sword for you, we will be more than happy to help you find the one that speaks to you the most. Please feel free to contact us.