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1945–1946 (Showa 20–21)
Tokyo (GHQ confiscation; whereabouts thereafter unknown)
Forces
Tokugawa Main Family (surrendering party)
GHQ (confiscating party)
About 13 min read
On August 15, 1945, Japan accepted the Potsdam Declaration and surrendered unconditionally. Under the occupation administration of the GHQ (General Headquarters of the Supreme Commander for the Allied Powers), a 'Weapons Surrender Decree' was issued nationwide, and the confiscation of weapons, including swords, began. Amid the chaos of the occupation period, the Honjo Masamune—considered one of the finest blades in Japanese sword history—was lost forever. Its loss represents far more than the disappearance of a cultural artifact; it symbolizes the end of the spiritual significance that the Japanese sword held as 'the soul of the samurai,' and the wound remains deep in the hearts of sword enthusiasts, historians, and cultural property officials to this day.
Masamune is regarded as one of the greatest swordsmiths in Japanese sword history, active in Kamakura in Sagami Province (present-day Kanagawa Prefecture) during the late Kamakura period (late 13th to early 14th century). As the founder of the Soshu tradition, his works set the standard for all swordsmiths of later generations, renowned for the beauty of the internal iron structure known as jikei and his superb forging technique that achieved both flexibility and hardness. It is said that Masamune's disciples and successors (the 'Ten Disciples of Masamune') scattered across the land and nurtured the various schools of Japanese sword-making.
The Honjo Masamune is particularly renowned among the several dozen extant swords made by Masamune. A large tachi measuring approximately 79.8 cm (2 shaku 6 sun 3 bu), it received its name from the Sengoku-period warlord Honjo Shigenaga of Echigo (present-day Niigata Prefecture), who owned it.
The provenance of the Honjo Masamune traces through the center of samurai society from the Sengoku to Edo periods. After being owned by the Honjo clan of Echigo during the Muromachi and Sengoku periods, it is said to have passed to Uesugi Kagekatsu, and subsequently came under Tokugawa control in the reorganization following the Battle of Sekigahara (1600).
During the Edo period, the Honjo Masamune was carefully maintained as a personal treasure (omote-moto odōgu) of the Tokugawa shogunate. It was recorded in the Kyōhō Meibufutsuchō (Catalog of Named Blades), compiled at the command of the eighth shogun, Tokugawa Yoshimune, confirming that the Tokugawa preserved it as the finest sword in the realm. After the Meiji Restoration, it was inherited by the Tokugawa main house and continued to be treasured as 'the greatest treasure of the Tokugawa clan' into the modern era.
Immediately after Japan's defeat in 1945, the GHQ issued orders to confiscate civilian swords and weapons as part of Japan's disarmament and demilitarization. Though initially targeting military weapons, the actual implementation widely confiscated swords owned by civilians, samurai families, and sword collectors.
Following the GHQ weapons confiscation order, Japanese swords were brought to police stations and military government offices across the country. It is estimated that at least tens of thousands (some sources suggest hundreds of thousands) of Japanese swords were confiscated, destroyed, or removed overseas during this period. The massive sword seizure was poorly managed because the GHQ itself had insufficient recognition of the cultural value of Japanese swords, and American soldiers at the local level frequently took swords as souvenirs or mementos.
Tokugawa Iemasa, the head of the Tokugawa main house, complied with GHQ orders and surrendered the family's inherited swords. The Tokugawa collection of named blades, including the Honjo Masamune, became subject to confiscation during this period.
The most specific record currently known regarding the Honjo Masamune's confiscation is a U.S. military confiscation record allegedly created in January 1946. According to this record, the U.S. Army sergeant responsible for receiving multiple named swords, including the Honjo Masamune, was identified as Sergeant Coldy Bimam, with his address recorded as Kaneohe or a similar location.
However, even this record itself lacks consensus among researchers regarding the interpretation of the original text and the accurate spelling of the name, and the existence of the individual 'Bimam' has not been confirmed, nor have his descendants been identified. The Japanese government and sword-related organizations have conducted location investigations for decades since the war, but the whereabouts of the Honjo Masamune remain unknown.
The loss of the Honjo Masamune carries special significance because it represents more than the disappearance of a cultural artifact; it means the loss of the very core of the spiritual and cultural meaning of the Japanese sword.
Masamune is widely recognized as 'the greatest swordsmith in Japanese sword history,' not only by sword enthusiasts and scholars but also by the general Japanese public. Several of Masamune's swords remain designated as National Treasures or Important Cultural Properties and are displayed in institutions such as the Tokyo National Museum and the Kyoto National Museum. However, the Honjo Masamune stood among these as a particularly large example of the great tachi form and occupied a special place in sword history as embodying the pinnacle of Masamune's forging mastery.
The fact that 'the soul of the Japanese sword was lost forever in the chaos of postwar cleanup' profoundly shocked those who treasured the Japanese sword as 'the soul of the samurai and symbol of Japanese culture.' The problem of inadequate cultural property protection under occupation rule was most starkly demonstrated by the disappearance of the Honjo Masamune.
The search for the Honjo Masamune has continued intermittently from the postwar period to the present day. The Japan Sword Preservation Society, the Cultural Affairs Agency, and the Ministry of Foreign Affairs, among others, have sought information, and repeated inquiries have been made to the U.S. side. In 1996, record searches were conducted at the U.S. National Archives and Records Administration (NARA), but no definitive leads were found.
In the 21st century, the search has continued in various forms, including calls for information online, monitoring of antique markets and auction information in the United States. However, as of 2026, the whereabouts of the Honjo Masamune remain unknown.
The Honjo Masamune disappearance is the most symbolic event showing how Japanese swords have been tossed about amid the turbulence of history. A blade guarded at the cost of life by Sengoku warlords, treasured for 300 years by the Tokugawa shoguns, and one that became the standard for all smiths of later generations through its sharpness and beauty—vanished in the confusion of defeat. Its loss means the eternal severing of the Japanese sword's role as 'a bridge to bygone eras,' leaving an indelible mark on the hearts of all who love the sword. The quest to find Masamune's blade is also a quest that continually asks the meaning of the Japanese sword itself.