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Understanding the Japanese sword authentication system
The NBTHK (Nihon Bijutsu Token Hozon Kyokai) is a public interest foundation dedicated to authenticating and preserving Japanese swords. Established in 1948, it is recognized worldwide as the highest authority in sword appraisal. NBTHK papers objectively certify the authenticity and quality of a sword and have a significant impact on its collectible value and asset assessment.
The registration card is a legally required document to possess a sword in Japan (issued by the prefectural board of education). An appraisal paper (e.g. NBTHK) is an optional quality assessment and does not replace the registration card.
Note: schematic for explanation only. It differs from the actual format of a registration card or appraisal paper.
Source: Agency for Cultural Affairs, prefectural boards of education, NBTHK
NBTHK certification is divided into four grades from lowest to highest: Hozon, Tokubetsu Hozon, Juyo, and Tokubetsu Juyo. Each grade is awarded only to swords that meet rigorous evaluation criteria; higher grades indicate greater historical and artistic significance.
Swords the NBTHK deems worthy of preservation. Authenticated as genuine and meeting a minimum standard of condition. Widely recognised as an entry-level certification for collectors; examinations are held several times per year.
Awarded to Hozon-certified swords that show particularly fine workmanship and condition. Requires a supplementary examination beyond Hozon, assessing the overall quality of the hamon, jihada, and sugata.
Awarded to swords of exceptional historical and artistic merit. Selected through a rigorous annual examination (Juyo Token-to Shinsa) with a very low pass rate. Juyo recognition is a near-pinnacle evaluation; many swords considered masterpieces hold this grade.
The highest NBTHK grade, awarded to Juyo-certified swords of outstanding historical and artistic excellence. Determined through the Tokubetsu Juyo Token-to Shinsa, held less frequently than the Juyo examination, with only a very small number of swords selected. Some Tokubetsu Juyo swords are considered comparable in quality to nationally designated Important Cultural Properties, though the two are separate classification systems.
Applications for NBTHK examination require submission of the original registration card (Torokusho) issued by the prefectural board of education — photocopies are not accepted. The examination schedule and requirements differ by grade.
Held several times a year; Hozon and Tokubetsu Hozon are reviewed in the same session. The original registration card must be presented. After passing Hozon, an application for Tokubetsu Hozon can be made in the same session or at a subsequent one.
Held once a year. Swords holding Tokubetsu Hozon certification are eligible for consideration. Swords are deposited at the examination venue for detailed assessment by specialist examiners over the examination period.
The highest-level examination, open to Juyo-certified swords. Held less frequently than the annual Juyo examination; the number of swords awarded Tokubetsu Juyo certification is extremely small. Selection criteria are applied with exceptional stringency across both artistic and historical dimensions.
An NBTHK paper records: (1) the certification grade (Hozon, Tokubetsu Hozon, Juyo, or Tokubetsu Juyo); (2) the attributed maker or 'unsigned' (mumei); (3) physical measurements including blade length (nagasa) and curvature (sori); (4) the examination result (passed); and (5) the date of issue and serial number. Always verify that the measurements and attribution on the paper match the physical sword.
An NBTHK paper and a registration card (Torokusho) are two entirely different documents. The Torokusho is a legally mandatory document issued by the prefectural board of education under the Firearm and Sword Possession Control Law; it is required by Japanese law to possess a sword. The NBTHK paper is an optional quality certificate issued by NBTHK — it does not replace the Torokusho. Both are needed for different purposes: the Torokusho for lawful possession, the NBTHK paper for quality assurance.
Certification may be applied for directly through NBTHK or through an NBTHK-affiliated sword dealer. Applications require the original registration card, a completed application form, and payment of the examination fee. TOUKENZA can assist with obtaining certification — please feel free to contact us.