Antique Japanese Sword Katana Attributed to Den Naminohira Yasuyuki with NTHK Kanteisho Certificate
【Description】
This blade is attributed to Den Sasshu Naminohira Yasuyuki (伝薩州 波平安行) during the late Muromachi period according to NTHK appraisal. The Naminohira school was established in the late Heian period by Masakuni, a swordsmith of the Yamato tradition who migrated to Satsuma. Blades produced before the late Nanbokucho period are referred to as Ko-Naminohira (Old Naminohira), while those made afterward are known as Sue-Naminohira (Later Naminohira). Swordsmiths of this lineage were known for incorporating the characters “Yuki” (行) or “Yasu” (安) into their signatures.
The name Naminohira literally means “calm waves,” and as such, swords from this school were especially prized by samurai in naval forces as auspicious weapons. According to legend, when Masakuni sailed from Yamato to settle in Satsuma, he offered a sword to the sea in prayer for safe passage and to calm the waves. From that time on, he adopted the name Naminohira Yukiyasu (波平行安), meaning “the waves are calm, and the path is peaceful.” From the late Heian period to the end of the samurai era, the Naminohira family upheld their craft and legacy for nearly a thousand years. The maker’s name, Yukiyasu, lasted many generations and according to its NBTHK appraisal, this particular blade was signed by a late-gen Yukihira from the late Muromachi period.
*Please keep in mind that there are a few Kitae Kizu on the blade. If you like to see the detailed condition, please feel free to contact us.
【Blade】
Cutting Edge Length (Nagasa): 63.5cm (25.0 inches)
Curvature (Sori): 1.4cm (0.55inches)
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 motif of this Fuchi-Kashira seems to be a conch shell, known as “Horagai” (法螺貝) and Shinobue (篠笛, flute, Japanese woodwind instrument). The conch shell originates from Hinduism and is closely linked to the teachings of Buddha. Historically, Yamabushi (mountain ascetics) used it to convey sermons. The conch was brought to Japan around 806 AD by monks like Kukai (空海) and Saicho (最澄), who returned from Tang China, with five of the eight bringing conch shells. Its sound represents the teachings of Buddha, making it a sacred instrument in Japanese esoteric Buddhism. The conch is one of the Eight Auspicious Symbols in Tibetan Buddhism, symbolizing purity and the dissemination of Buddhist teachings.
Tsuka and Menuki：Tsuka is the handle of the Japanese sword and Menuki is its decoration.
The motif of this Menuki is the seashells (貝尽くし, Kai-zukushi). This pattern is a combination of different types of seashells. It is often designed with a seaside scene or wave pattern. You would feel the refreshing atmosphere of summer. Bivalves, especially clam, its shells cannot be combined with any other clam’s frame; therefore, its pattern represents happy marriage.
Seashell is called Kai (貝) in Japanese. Because of its pronunciation, the seashell has another meaning. There is a word Yarigai (やりがい, worthwhile). As a part of this word has the same accent as Kai (貝 is read Gai in some cases), Japanese people found this meaning. Also, since seashells are hard and combine only with their pair, people thought it represented a robust defense. Due to these meanings that inspire warriors who go to the battlefields, Samurais might have loved this motif.
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 theme of this Tsuba is the wave. As waves’ movements continue endlessly, the wave pattern represents eternity, immortality, longevity, birth, etcetera. Also, since tides repeatedly change the shape and terrain of rocks, some people hoped for a strong will by using this motif. People used this pattern wishing for an indomitable spirit to rechallenge time and time without giving up. Thanks to its dynamic design, this motif has been appreciated, especially for men’s Kimono (traditional Japanese costume).
There is a geometric design of wave pattern; the Seigaiha Monyou (青海波文様). According to a theory, this design symbolizes the benefits of the vast sea. This infinite wave pattern is an auspicious pattern. People used it, wishing eternal happiness and peaceful lives for the future.
Saya: Saya is the scabbard for the Japanese sword.
This scabbard 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: NTHK Kanteisho Certificate for the blade (No. 13211)
NTHK, also known as NPO Nihon Touken Hozon Kai, is the oldest organization for sword authentication of Japanese swords in modern times. It was established in 1889 during the post-Samurai era. They authenticated the blade on May 18th in the 7th year of Reiwa (2025). 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: Aichi 52402
The Board of Education in Aichi prefecture issued a registration paper for this sword. It is called Jyu Hou Touken Rui Torokusho (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.
【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 700 Japanese swords for the past few years (～2024) 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.
