The question most collectors ask before submitting to the NBTHK is: will it pass? That is a reasonable question, but it is the second question you should be asking. The first is: what do I want to know about this blade, and is NBTHK shinsa the right way to find it? Understanding what the process can and cannot tell you — and what affects the result — leads to better decisions before, during, and after submission.
This guide walks through the NBTHK's published criteria, what disqualifies a blade from consideration, what the different possible outcomes mean, and how to think about preparation by grade. Tozando handles NBTHK submission on behalf of overseas collectors; details are at the end.
What NBTHK Shinsa Answers — and What It Does Not
審査とは何か · setting expectations before you submitNBTHK shinsa is a preservation-focused assessment. The question the examiners are answering is: does this blade meet the standard for formal recognition as a work of Japanese sword art worthy of preservation? The specific judgments within that — is this attribution correct, is this period consistent, is this construction sound — are what drive the result.
What shinsa does not do: it does not appraise market value, it does not provide insurance valuations, and it does not resolve every question of attribution with finality. A certificate documents what the NBTHK's examiners concluded at the time of that shinsa session, based on what was presented.
With that frame, the practical question shifts: not "will it pass" but "what will I learn, and is this the right moment to submit?" A blade in poor condition may pass at a lower grade than it would warrant after proper preparation. A blade you plan to sell benefits from the clearest possible documentation. These are different situations that call for different approaches.
What Disqualifies a Blade from Consideration
不合格要因 · conditions the NBTHK criteria explicitly addressThe NBTHK's official criteria describe both the conditions for acceptance and the conditions that prevent it. Some are absolute; a small number allow for narrow exceptions. Understanding these before submission avoids wasted time and cost.
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Ha-giri (刃切) — a crack running into the edge A structural flaw in the cutting edge. The NBTHK criteria list this explicitly as a disqualifying condition. No grade is available for a blade with ha-giri.
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Severe rust — hamon not visible If the hamon and boshi cannot be observed due to rust, the blade cannot be assessed. The criteria note that "slightly aged polish" is acceptable, but a blade where the fundamental characteristics are obscured by rust is not examinable. This is not an aesthetic bar — it is a practical one: examiners cannot assess what they cannot see.
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Gimei (偽銘) — false signature A blade with a known false attribution. If the mei is determined to be false during shinsa, the blade will not receive a certificate. Note that this is determined by the examiners, not by prior documentation — a blade that has circulated with an incorrect attribution may have that attribution revised.
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Saiha (再刃) — re-tempered blade A blade whose hamon has been re-created after the original was lost is disqualified as a general rule. Exception: the NBTHK criteria allow for a narrow exception for signed works by noted smiths of the Nanbokuchō period (pre-1392) or earlier, where the blade has significant documentary value, the mei is genuine, and the rust on the blade and nakago is minimal. When this exception applies, the certificate includes a notation.
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Works by living smiths The NBTHK does not issue certificates for blades by smiths who are still living. This is not a judgment on quality — it is a formal boundary of the preservation-focused shinsa system. Blades by smiths of the Meiji era and later who are deceased can be considered, subject to the condition that they are signed and of good quality.
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No tōken toroku-shō (登録証) — no registration certificate A blade without a valid Japanese registration certificate cannot be submitted. This is a legal precondition, not an aesthetic one. The registration certificate documents the blade's lawful status in Japan and is required for the submission process to proceed at all.
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Non-Japanese swords Swords of foreign manufacture are outside the scope of NBTHK shinsa. The system exists to certify Japanese sword art specifically.
Five Things to Confirm Before Submitting
申請前の確認 · practical preparation by any collectorAssuming the disqualifying conditions above don't apply, the following are the practical questions to work through before submitting a blade.
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Confirm the registration certificate is in order The tōken toroku-shō must be present and valid. For blades held outside Japan, this question requires specialist advice — a blade exported without proper documentation cannot be submitted from Japan without first resolving its legal status. This step takes priority over everything else.
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2
Assess the condition of the polish The grade you are targeting determines how much this matters. For Hozon (the entry grade), an aged polish is acceptable as long as the hamon is visible and the blade can be examined. For Tokubetsu Hozon, an upper-grade polish (上研ぎ) is required. For Jūyō, the highest available polish is recommended. If the polish is significantly degraded, consider whether improving it before submission is appropriate for the grade you have in mind.
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Examine the blade for rust, flaws, and repairs Minor fatigue, scratches, and repairs are acceptable at the Hozon level if the blade is still worth viewing. At Tokubetsu Hozon, a sound blade is an advantage; at Jūyō and above, the bar rises further. The question at this stage is not whether flaws exist — most historic blades have some — but whether they affect the blade's assessability and overall condition relative to the grade being sought.
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Research the attribution and existing documentation If the blade is signed, review what is known about that smith and whether the signature's characteristics are consistent with known examples. If previous papers exist — including pre-1982 Kicho or Tokubetsu Kicho certificates — these are part of the picture and should be included with the submission. Prior documentation can inform, though does not bind, the current examiners.
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Be clear about your purpose Are you certifying for a sale? For collection documentation? To confirm an attribution? Or to explore whether a blade warrants further investment in polish? The answer should shape which grade you submit for and whether the timing is right. Submitting a blade before it is at its best may produce a valid result — but not the strongest possible one.
What Each Grade Requires
等級別基準 · based on the NBTHK's published criteriaThe NBTHK's four current grades are sequential: each higher grade is a subset of the one below it. You cannot be awarded Tokubetsu Hozon without first holding Hozon; you cannot be considered for Jūyō without Tokubetsu Hozon. Understanding each grade's specific requirements clarifies both what you are aiming for and what the result will tell you.
The entry grade. A blade of any period and school whose signature is genuine (or, for unsigned blades, whose period, province, and school can be identified) and that is worth viewing despite minor condition issues. The NBTHK criteria note that some fatigue and flaws are acceptable at this level, as is an aged polish, as long as the blade can be examined.
Blades by deceased Meiji-era and later smiths can qualify if signed and of good quality. Shortened (磨上) blades, blades with the tang end trimmed (区送り), and blades whose construction has been altered are eligible. The position of the smith in the historical ranking is not a criterion at this level.
A subset of Hozon: the same fundamental criteria apply, but the blade's condition and quality must be appreciably better. For Shintō (new sword, Edo period) blades, structural soundness becomes part of the assessment — the quality of construction, not just the aesthetic, is judged. The form and character of the hamon are also criteria at this level.
Important limitations: unsigned blades from the Muromachi and Edo periods are generally excluded from Tokubetsu Hozon, with a narrow exception for unsigned work by noted smiths that is in outstanding condition. At this level and above, an upper-grade polish is required — a significantly aged or degraded polish will typically prevent a Tokubetsu Hozon result even if the blade would otherwise qualify.
For pre-Nanbokuchō unsigned blades, an aged polish can lead to a Tokubetsu Hozon rejection even where the blade itself is of appropriate quality — this is specifically noted in the official criteria.
A subset of Tokubetsu Hozon. Blades at this level are judged to be equivalent to nationally designated Important Art Objects (重要美術品). Pre-Nanbokuchō unsigned blades may be considered. For blades from the Muromachi period onward, a signature is required; for Edo period work and later, an original tang (生ぶ茎) with a genuine signature is effectively required.
At this level, the competitive field matters: the number of positions available in each shinsa session is limited, and blades of otherwise qualifying quality may not receive Jūyō designation simply due to the volume of strong submissions in that session. The highest available polish is strongly recommended before submission.
For Shintō blades, the position of the smith in historical rankings becomes relevant. Only the leading smiths of their era are realistically represented at Jūyō for this period.
The highest NBTHK certification grade. Blades at this level are judged to be equivalent to nationally designated Important Cultural Properties (重要文化財). The criteria specify "outstanding" work in outstanding condition with the highest documentary value. For Shintō, only the leading masters of the period — the NBTHK's criteria give Sukehiro, Shinkai, and Kotetsu as examples of smiths whose top work might qualify — are realistic candidates.
Requires an existing Jūyō Token certificate. This is not a grade that most blades in circulation will reach; for the collector who holds a Jūyō-designated blade and is considering this step, specialist consultation is the starting point.
Understanding What You Get Back
審査結果 · three possible outcomes and what each one meansShinsa produces one of three results for each submitted blade. Knowing what each means — including the one that is neither pass nor fail — allows you to respond to the result productively.
A result of "not awarded" — where the blade is submitted without prior papers and does not meet the grade criteria — means the blade can be resubmitted at a future session. It does not invalidate the blade or permanently mark it as uncertifiable; circumstances change, and a blade properly prepared and resubmitted may produce a different result.
Frequently Asked Questions
よくある質問 · questions collectors ask before submittingYes. There is no rule preventing resubmission. A blade that did not receive a certificate at one shinsa session can be submitted again at a future session. This is relevant both for blades that received a "hold" result and for blades where the owner has since had the polish improved or gathered additional attribution research.
Not inherently. A blade that is submitted and does not receive a certificate is in the same position as a blade that was never submitted — it is uncertified, which is a neutral status, not a negative one. What matters is the quality of the blade itself. A genuinely fine blade that did not pass in one session remains a fine blade; the question is whether the preparation, timing, or grade applied for was appropriate.
It depends on the grade you are targeting and the current state of the polish. For Hozon, an aged polish is acceptable if the hamon is visible. For Tokubetsu Hozon, an upper-grade polish is required. For Jūyō, the highest available polish is recommended. If you are uncertain, the safest course is to have a specialist assess the blade's current state before committing to either polish or submission. A re-polish is a significant intervention on a historic blade and should not be undertaken lightly.
The current examiners' finding takes precedence. If a blade with pre-1982 Kicho or Tokubetsu Kicho papers is submitted and the examiners determine the attribution should be revised, the new certificate will reflect their current finding. This is not necessarily a negative outcome — an updated attribution from the current NBTHK is authoritative documentation under the present system, whatever it says.
No. The NBTHK's criteria confirm that a blade without a shirasaya can be submitted if it has a koshirae (mounted fittings). A shirasaya is the more usual presentation, but its absence is not a disqualifying condition.
Yes, at the Hozon level. Shortened blades, blades with the tang trimmed, and blades whose construction has been modified are all eligible for Hozon consideration. The requirements become stricter at higher grades: for Jūyō and above, an original tang with a genuine signature is effectively required for Edo-period and later work.
NBTHK Submission Handled on Your Behalf
代理申請 · for overseas collectors purchasing through TozandoFor collectors outside Japan, the logistics of NBTHK submission — managing the registration documentation, coordinating with the shinsa schedule, and handling physical delivery in Japan — present a practical barrier that often goes unaddressed. Tozando offers a proxy submission service for blades purchased through us, handling the full process before the blade is shipped to the collector.
If you purchase a blade from Tozando and wish to have it assessed under the current NBTHK system before delivery, we manage the full submission process. The blade is submitted to the next available shinsa session; once the result is received, the blade — with all original documentation and the new NBTHK result — is shipped to you.
- Purchase the blade from Tozando and indicate your interest in pre-delivery NBTHK submission at the time of purchase.
- Tozando assesses the blade's current condition and advises on the appropriate grade to target, including whether any preparation (such as polish improvement) is recommended before submission.
- Tozando prepares and submits the blade to the next available NBTHK shinsa session on your behalf.
- The NBTHK examines the blade. The result is a new certificate, a hold, or — for blades with existing pre-1982 papers — genjō recognition.
- Tozando notifies you of the result and ships the blade with all documentation.
Shinsa sessions are held periodically throughout the year. We will advise on the expected timeline at the time of purchase.
Our collection includes blades with current-system NBTHK certificates and blades with pre-1982 papers eligible for submission. Every piece comes with full documentation and English-language specialist support.
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