Showa Military Sword Researchers and Preservation: The Specialists Excavating the Forgotten Value of Wartime Swords
* Image is for illustrative purposes only.Table of Contents
Academic Challenges in Showa Military Sword Research
Showa military sword research has a fundamentally different character from traditional Japanese sword research.
In traditional sword research, specialized sword literature such as authentication certificates, records of swordmakers, registers of famous blades, and rubbing collections serve as primary materials. However, military sword research requires additional primary sources: Imperial Japanese Army Ministry official documents, weapons factory records, personal diaries of officers, and wartime testimony records. Many records were treated as military secrets and destroyed or scattered during the chaos following the end of the war. The painstaking work of searching through surviving materials in the National Archives, the Institute for Defense Studies, and the Yasukuni Shrine Library becomes the starting point for research.
The backgrounds of researchers are also extremely diverse. In addition to those with expertise in art history and sword authentication, military historians, modern historians, and researchers conducting material analysis from perspectives of metallurgy and metal engineering have also entered the field. Through collaboration among these multidisciplinary experts, comprehensive research elucidating manufacturing techniques, historical context, and cultural significance becomes possible.
Furthermore, Showa military sword research entails ethical complexity. Military swords are inseparable from the context of the Pacific War, and research and display always require the balance between historical respect and objective analysis. When the owner is a descendant of family members or former military personnel, consideration beyond treating them as mere "objects" is necessary.
Basic Literature and Access to Primary Sources
To enter this field, it is essential to understand the foundational literature and materials.
As foundational literature in this field, the following two works may be cited.
| Resource | Content |
|---|---|
| "Japanese Swords of Yasukuni Shrine" by Nakagawa Yasuhiro | A must-read research work that systematically organized manufacturing records, lists of swordmakers, production numbers, and types of swords presented to Yasukuni Forge |
| "Showa Sword Compendium" published by Kogyei Publishing | An illustrated catalog covering Showa-era military swords with abundant photographs and detailed commentary, currently still heavily used as a practical reference for sword type identification and specimen authentication |
As primary sources, Imperial Japanese Army Ministry documents held in the National Archives are important. The process of establishing military sword specifications, revision histories of the Showa 9 Model and Showa 13 Model, and regulations for issuing swords to officers can be confirmed in official documents. Additionally, examination records of the Japan Sword and Art Preservation Society have practical value in authenticating Yasukuni swords and commissioned swords forged using traditional techniques.
In recent years, the development of digital archives has progressed rapidly. Through databases of the Institute for Defense Studies Library and the National Diet Library Digital Collection, access to materials that were once difficult to view has improved, greatly expanding the scope of research.
Repatriated Swords: Return from Battlefields to the Homeland and the Role of Researchers
The authentication, documentation, and acceptance of Showa military swords being repatriated from abroad is one of the most concrete practical challenges facing contemporary researchers.
After the end of the Pacific War, numerous military swords were taken out as war trophies by Allied soldiers to the United States, Britain, Australia, and other countries. The estimated number runs into tens of thousands, and they remain scattered today in the homes of retired veterans' families, antique markets, and auction houses. Researchers and enthusiast organizations in the United States continuously conduct location surveys and cataloging of Japanese swords in America, which has led to the discovery of repatriated swords.
Many family members have expressed the desire to return military swords brought home from battlefields by their grandfathers to Japan. In such cases, researchers, sword dealers, and museums serve as coordinators, handling authentication, transportation procedures, and coordination of recipient institutions. In some cases, the All Japan Swordmakers Association and local sword research societies serve as contact points, providing information on appropriate preservation facilities and information to family members.
Since cultural property repatriation is linked to the context of diplomacy and cultural policy, it often takes on aspects of historical reconciliation beyond simple commercial transactions. The involvement of researchers in this process is also an important opportunity to return academic knowledge to society.
Current State of Yasukuni Shrine Treasure Museum and Challenges in Preservation Activities
The Yasukuni Shrine Treasure Museum is an indispensable reference institution for researchers as a major repository of swords manufactured at the Yasukuni Forge.
Some of the swords donated and ceremonial swords manufactured at the forge are preserved and displayed, and are used as "standard works" of Yasukuni swords for comparison in specimen authentication. While not a permanent exhibition, they are made available to the public through special exhibitions held several times a year, providing opportunities to receive direct explanations from experts.
It faces serious challenges in preservation. Deterioration of the fittings—sheath, grip, and hanging cord—is particularly evident. Unlike metal components, organic materials such as lacquer, wood, silk, and sharkskin show marked deterioration over time, making intact examples of the fittings on existing Showa military swords increasingly rare. Throughout the country, efforts to repair while maintaining the original state as much as possible through collaboration between cultural property restoration specialists and sword researchers are underway.
Expansion of Global Research Networks
Showa military sword research extends beyond Japan, with an international community forming.
In the United States, JSSUS (Japanese Sword Society of the United States) plays a central role in military sword research and serves as a bridge connecting American collectors and Japanese researchers through its journal and seminars. Specialist collectors and researchers of Showa military swords also exist in Britain, Germany, and France, contributing to the accumulation of international knowledge through academic papers and the publication of illustrated catalogs.
The advancement of digital technology brings new possibilities. The following scientific methods are being introduced to complement traditional visual authentication:
- Precise recording of blade shape through three-dimensional scanning
- Steel material composition analysis through fluorescent X-ray analysis
- Hamon pattern identification using AI
These technologies have the potential to provide clues linking unsigned Showa swords without records to their makers and manufacturing periods.
Showa military sword research is a multidisciplinary academic field where modern and contemporary Japanese history, military history, cultural property protection, and international relations intersect. To fairly evaluate "forgotten swords" not as mere antiques but as witnesses to the Showa era and to pass them on to the next generation—this is the shared mission of researchers and conservators working in this field.
