The divided-courts war impoverished the court society that had sustained Kyōto’s most refined work. With the last Rai masters the classic line effectively closed, while Hasebe and Nobukuni carried the new Sōshū manner into the capital.
NihontoWatchNihontoWatchThis blade is attributed to Chiyozuru school(千代鶴). It is estimated it was forged during the last years of the Nanbokucho-early Muromachi period(late 14th century-early 15th century). Chiyozuru school The founder of Chiyozuru school was Kuniyasu(國安). It is said that Kuniyasu was the grandson of Kunimatsu, a younger brother of Rai Kunitoshi. Rai Kunitoshi was one of the most famous swordsmiths in Yamashiro province(Kyoto). Kuniyasu is known as the prominent figure of the Echizen Rai school. Kuniyasu was forging swords in Yamashiro province but moved to Echizen prefecture and founded Chiyozuru school. The name of Chiyozuru(千代鶴) came from the fact that Kuniyasu’s name during his childhood was Chiyozurumaru. The school prospered during the last years of the Nanbokucho-early Muromachi period(late 14th century-early 15th century). Rai school＆Yamashiro province Yamashiro province was famous for its sword-making style called YAMASHIRO-DEN. YAMASHIRO-DEN’s origin dates back to the Heian period(794 A.D), when the capital city was moved from Nara to Kyoto. The swordsmiths in Yamashiro province initially prospered by forging swords for court nobles and imperial families. Later on, they also forged swords for feudal lords after Samurai military government took control of Japan. There are so many renowned swordsmiths from this region. It is said that the founder of YAMASHIRO-DEN was Sanjo Munechika. And there are seven prestigious schools in this region. One of them is Rai school is one of the most prestigious ones among YAMASHIRO-DEN. And swords forged by members of Chiyozuru school have characteristics of Rai school. The significance of the school’s name Chiyo(千代) means one thousand years, and Zuru(Tsuru:鶴) means crane in Japanese. The name Chiyozuru sounds very auspicious in Japanese. Therefore, the sword forged by this school were popular for any ceremony or events such as weeding from ancient times. There is a proverb that says cranes and turtles live a long life. It says cranes have even one thousand years lifespan; therefore, cranes and turtles have been considered as the symbol of longevity since a long time ago. Also, as cranes make compatible couples, it represents happy marriage. This blade is appraised as a Hozon Token (保存刀剣) issued by NBTHK (Nihon Bijutsu Touken Hozon Kyokai:日本美術刀剣保存協会). *Please keep in mind that there are a couple of Kitae Kizu and black rust on the blade. Koshirae The design of this sword mounting (koshirae) consistently features the Gosan-no-Kiri motif (五三の桐文様), a traditional Japanese paulownia crest. The paulownia design has long been regarded as a prestigious symbol in Japan and was once reserved exclusively for the Imperial family and powerful political authorities. Today, it is also widely appreciated and used as a family crest among ordinary households. Since ancient times, the paulownia tree has been considered a sacred plant. According to East Asian tradition, the mythical bird Hōō (鳳凰, Fenghuang) is said to rest its wings only upon the paulownia tree, giving the motif auspicious and noble associations. The paulownia crest is generally composed of three upright flower clusters and three leaves. The number of blossoms depicted on each cluster determines the rank and variation of the design, with the Gosan-no-Kiri being one of the most representative and well-known forms. The paulownia crest is also famously associated with Toyotomi Hideyoshi, one of the most celebrated samurai leaders in Japanese history. According to one theory, Hideyoshi originally used the Omodaka (沢瀉, arrowhead) crest; however, he was later granted permission to use the paulownia crest by Oda Nobunaga, the renowned military commander of the Sengoku period. Because of this historical background, the paulownia motif came to symbolize authority and prestige, and it is still used today as an emblem of the Japanese Government. In addition, the surfaces of the tsuba, fuchi-kashira, and kozuka are decorated with a technique known as nanako-ji (魚子地). This refined metalworking technique is created by carefully punching countless tiny dots into the metal surface with a chisel, forming a delicate texture resembling fish roe. The craftsmanship of these fittings is exceptionally meticulous and demonstrates the high level of skill found in traditional Japanese sword mountings. Kozuka *Please keep in mind that the Kogatana (small knife attached to Kozuka case) is just a metal plate (not real Kogatana blade). Authentication Paper They authenticated the blade on February 16th in the 8th year of Reiwa (2026). They appraised it as Hozon Touken, the blade worth preserving for Japanese society.
Chiyozuru School千代鶴派
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Yamashiro-den · Echizen
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The Chiyozuru lineage took root in Echizen Province during the Nanbokuchō period, and the setsumei consistently trace its origin to Rai Kuniyasu (来国安). He is said to have been born in Yamashiro Province, with one tradition holding him a grandson of Rai Kunisue; he later moved to Echizen, where the meikan place him around the Jōji and Sadaji eras (ca. 1362 to 1368). A parallel tradition, recorded on the signed tachi attributed to Morihiro, names Chiyozuru Kuniyasu[[c:1]] as a disciple of Rai Kuniyasu and the founder of the line. From this root descend the smiths the blades document: Morihiro (守弘), placed in the Kuniyasu line across two generations, the first set in the Ōei era (1394 to 1428) and the second in the Kakitsu (1441 to 1444) and Bun'an (1444 to 1449) eras; and Mitsuyuki of Tsuruga[[c:2]], recorded as a student of Echizen Kuniyuki and known from a rare Kakei-dated tantō. The Yamashiro inheritance runs through the whole group, even as the workmanship moves away from the Kyoto homeland into a provincial Hokuriku register. Two stylistic strands run through the corpus, and recognizing the hand means reading where a given blade falls between them. The Rai-derived work, seen in the katana attributed to Rai Kuniyasu, shows itame mixed with mokume and nagare-hada, the grain tending to stand (hada-dachi) with thick ji-nie and frequent chikei; the steel carries a whitish or, in places, slightly blackish cast that the setsumei read as a provincial inflection of Yamashiro.
The hamon on these is a chū-suguha mixed with ko-gunome, the edge breaking into hotsure, kuichigai-ba, and nijūba, with ashi, yō, kinsuji, and sunagashi running through and a bright nioiguchi; the bōshi enters midare-komi or shallow notare-komi, turning in ko-maru with hakikake, at times vigorous enough to give a flame-like (kaen) impression. The Morihiro strand turns toward a gunome-based midareba with a chōji tendency, tobiyaki, and muneyaki, the forging moving toward masame near the edge; the setsumei mark this gunome-toned, nie-laden manner as differing in character from the Rai style and proper to the later line. For kantei, the setsumei set the diagnostic problem plainly: a Chiyozuru blade can at first glance resemble the orthodox Yamashiro Rai work, particularly around Rai Kunimitsu, yet careful reading of the standing grain, the whitish or blackish jigane, and the rustic activity in the bōshi beyond what the Kyoto homeland shows directs the attribution to Echizen. The boldest Nanbokuchō pieces, wide in mihaba with ō-kissaki and muneyaki, invite comparison with Hokuriku contemporaries such as Etchū Tametsugu (越中為継), but the character of ji and ha keeps them within the Chiyozuru fold. Signed examples anchor the line: Morihiro tachi and a Kakitsu 1 (1441) dated wakizashi carrying his Tōzaemon no Jō name, and the Mitsuyuki tantō whose Kakei date makes it documentary material of high value, dated works of the group being extremely scarce. The Morihiro tachi of Jūyō-Bijutsuhin standing is recorded in the Kōzan Oshigata, Kokon Kajibikō, and Kantō Zuiroku. Across the corpus the line holds a distinct place among Nanbokuchō and early Muromachi Hokuriku smiths, carrying a Yamashiro pedigree into a workmanship the appraisers read as its own. Learn more →
| Smith | Era | Designated |
|---|---|---|
| Kuniyasu國安 | 1345-1350 | 4 |
| Ieyoshi家善 | 1487-1489 | 0 |
| Kagemori景守 | 1394-1428 | 0 |
| Munemitsu宗光 | 1441-1444 | 0 |
| Iemasa家正 | 1492-1501 | 0 |
Yamashiro in the Nanbokuchō period
The divided-courts war impoverished the court society that had sustained Kyōto’s most refined work. With the last Rai masters the classic line effectively closed, while Hasebe and Nobukuni carried the new Sōshū manner into the capital.
Certifies a genuine blade worth preserving: a signature confirmed correct, or, if unsigned, an era, province, and school that the NBTHK can reliably identify.
The NBTHK (Nihon Bijutsu Tōken Hozon Kyōkai, the Society for the Preservation of Japanese Art Swords) is a public-interest incorporated foundation founded in 1948 and supervised by Japan’s Agency for Cultural Affairs (Bunkachō); it is based at the Japanese Sword Museum in Tokyo. Its expert panels physically examine each submitted work (shinsa) and issue a certificate (kanteishō) ranking it by artistic and historical merit. NBTHK papers are the most widely recognized standard of authentication for Japanese swords and fittings.
NBTHK official siteReturns/exchanges limited to defects caused by shipping (except willful misconduct or gross negligence by the company); customers must contact within 72 hours of receiving the product.
Certificate reading — 無銘（加州勝家）