The NBTHK is Japan's foremost sword authentication organization, founded in 1948. Only about 2 out of every 10 submitted blades pass even the entry-level Hozon certification. There are 4 current levels: Hozon, Tokubetsu Hozon, Juyo Token, and Tokubetsu Juyo Token, each representing a meaningful jump in quality standard and market value.
Old certificates issued before 1982 (Kicho, Tokubetsu Kicho) have lost their validity as authentication guarantees. Before purchasing any nihonto over $3,000, verify the certification is current, genuine, and physically matches the blade. Browse our authenticated collection.
Submit 10 nihonto to the NBTHK for Hozon certification. On average, 8 of them will fail. That pass rate is not an anomaly. It is by design, and understanding it changes how you read every listing that claims to come with "papers."
An NBTHK certificate is the closest thing to a guarantee you can get when buying an authentic Japanese sword online. But "closest thing" is not the same as "absolute proof," and the difference between those two positions has cost buyers thousands. This guide covers exactly what each certification level means, what it does not cover, and how to verify one before any money changes hands.
What Is the NBTHK and Why Does It Matter?
The NBTHK (Nihon Bijutsu Token Hozon Kyokai, or the Society for the Preservation of the Japanese Art Sword) is the primary organization responsible for authenticating nihonto in Japan. Founded in 1948, it operates independently from any dealer or government body and is recognized globally as the gold standard for sword authentication.
When a sword is submitted to the NBTHK for evaluation, the process is called shinsa (審査). A panel of expert judges examines the blade, assessing its signature (mei), period, school, condition, and craftsmanship. The written verdict is called origami, which is also the common term for the certificate itself.
The process is deliberately slow. Depending on the submission session, receiving a result can take anywhere from 3 months to over a year. That pace is a feature. The NBTHK does not rush judgments, and the weight of those judgments reflects that care.
Source: Unique Japan
The 4 Current Certification Levels Explained
The current NBTHK certification system has been in place since 1982. There are 4 levels, each with distinct criteria and a distinct paper color. Here is what each one actually means.
| Level | Japanese Name | Paper Color | Number in Existence | Meaning |
|---|---|---|---|---|
| Hozon | 保存刀剣 | Yellow | Hundreds of thousands | Worthy of Preservation |
| Tokubetsu Hozon | 特別保存刀剣 | Brown | Tens of thousands | Especially Worthy of Preservation |
| Juyo Token | 重要刀剣 | Formal paper with oshigata | Approximately 10,000 | Important Work |
| Tokubetsu Juyo Token | 特別重要刀剣 | Formal paper with oshigata | Approximately 700 | Especially Important Work |
Hozon (保存刀剣): The Entry Level That Is Not Actually Easy
Hozon is the first rung of the current certification hierarchy, and it carries more weight than many buyers realize. To pass Hozon, a signed blade must have a genuine signature. An unsigned blade must have an identifiable period, province, and school. The blade must be aesthetically sound, with no chip in the cutting edge. Any fake signature is an automatic disqualification, with no exceptions.
That 2-in-10 pass rate matters here. Dealers who regularly submit blades to the NBTHK know that even blades they believe are genuine sometimes come back without certification. The NBTHK does not issue Hozon out of goodwill. If a blade passes, it earned it.
Hozon certificates can also be issued for koshirae (complete sword mountings) and individual fittings like tsuba, independently of the blade itself.
Tokubetsu Hozon (特別保存刀剣): The Meaningful Step Up
Tokubetsu Hozon requires that a blade first have Hozon status and then clear all Hozon criteria at a substantially higher level. A blade that is merely "adequate" does not reach Tokubetsu Hozon. The NBTHK is looking for exceptional workmanship and preservation.
Two categories of blades are generally excluded from Tokubetsu Hozon regardless of their other qualities: blades that have been re-tempered (yaki-naoshi), except in rare cases of pre-Nanbokucho era signed blades by famous smiths, and Muromachi or Edo period unsigned blades, unless attributable to a famous smith in excellent condition.
Juyo Token (重要刀剣): Where Rarity Begins
Of approximately 2.8 million registered swords in Japan, roughly 10,000 hold Juyo Token status. That is 0.36% of the total. A blade must already hold Tokubetsu Hozon certification before it can be submitted for Juyo. The NBTHK judges it against the standard of Juyo Bijutsuhin (Important Art Object), a separate national cultural designation. Blades that reach this level are considered among the pinnacle of Japanese sword-making.
Tokubetsu Juyo Token (特別重要刀剣): The Rarest of All
Approximately 700 blades worldwide hold Tokubetsu Juyo Token certification. These are judged equivalent in quality to Juyo Bunkazai (Important Cultural Property). When one comes to market, it is an event. Pricing at this level is almost always by private negotiation rather than fixed listing.
What Each Certificate Level Actually Does to Price
Certification has a direct, measurable impact on market value. The numbers below are based on real transaction data from specialist dealers including our own sourcing network, Samurai Museum Shop, and auction results through 2025-2026.
Source: Unique Japan
| Period | No Certification | Hozon | Tokubetsu Hozon | Juyo Token |
|---|---|---|---|---|
| Shinto / Shinshinto | $2,000-6,000 | $4,000-12,000 | $12,000-40,000 | $50,000+ |
| Koto (pre-1596) | $3,000-8,000 | $5,000-15,000 | $15,000-50,000 | $80,000-200,000+ |
| Gendaito (modern) | $2,000-5,000 | $4,000-10,000 | Rare, $15,000+ | Exceptional only |
To put those numbers in concrete terms: a Kawachi no Kami Kunisuke 2nd (Osaka Shinto, a highly respected smith) katana with Juyo Token certification sold for $32,273 through Samurai Museum Shop in 2026. A comparable blade from the same smith without certification, or with only Hozon, would trade significantly below that.
The jump between Hozon and Tokubetsu Hozon is real but gradual. The jump to Juyo Token is a different category entirely. At that point, you are not buying a sword. You are acquiring a piece of Japanese cultural heritage that happens to be available to private collectors.
What certification does not guarantee
This is the part most guides skip, and it is where buyers get into trouble.
- A Hozon certificate does not guarantee the blade is free of all flaws. Minor kizu (flaws) are permitted at Hozon level if they do not significantly affect appreciation.
- A certificate does not set or guarantee a specific market price. Two Hozon blades of the same period can have very different values based on smith reputation, condition, and koshirae quality.
- A certificate does not account for changes since the shinsa. If a blade was polished or the nakago altered after certification, the cert no longer accurately describes the blade's current state.
- A certificate does not replace the Token Toroku-sho (刀剣登録証), the Japanese government registration card that must accompany all legally registered swords. Both documents should be present.
We cover authentication red flags in detail in our guide on identifying fake vs real antique katana. The certification question and the authenticity question overlap but are not identical.
Old Certificates: Kicho, Tokubetsu Kicho and Why They No Longer Count
Old NBTHK certificates issued before 1982 are no longer valid as authentication guarantees under the current system. Full stop.
The old hierarchy included Kicho (貴重), Tokubetsu Kicho (特別貴重), and Koshu Tokubetsu Kicho (甲種特別貴重). These were the grading standards of their time, and the blades that received them were genuinely examined. But the NBTHK itself has stated that owners of blades with old-system certificates should submit for re-evaluation under the current system.
Why does this matter for buyers? Because old certs are still presented by some sellers as proof of quality, sometimes prominently, sometimes as if they are equivalent to current Hozon or Tokubetsu Hozon. They are not. A blade with a Tokubetsu Kicho certificate from 1975 may well be a genuine, high-quality nihonto. It may also have accumulated damage, repairs, or polishing in the 50 years since that appraisal. Without current NBTHK certification, there is no way to know.
When you see a listing featuring Kicho or Tokubetsu Kicho as the primary credential, treat it as you would a blade with no current certification: ask for a re-evaluation, adjust your offer accordingly, or walk away.
A collector contacted us in late 2024 after purchasing a Shinto katana for $9,500 based partly on a Tokubetsu Kicho certificate. When he submitted it for current shinsa, the NBTHK found the jihada had been repaired in a way that affected its beauty significantly. The blade received no current certification. Its re-sale value was under $4,000.
NBTHK vs NTHK: Which Should You Trust?
The NTHK-NPO (Nihon Token Hozon Kai) is a separate organization that also issues nihonto certifications. It is legitimate, and its certificates are not without value. But there is a clear market hierarchy.
NBTHK certification carries significantly more weight with serious collectors and at auction. When two otherwise comparable blades are offered side by side, one with NBTHK Hozon and one with NTHK certification, the NBTHK piece will almost always command a higher price and attract more qualified buyers.
This is not a statement about the NTHK's competence. It is a statement about market recognition built over decades. For a buyer making a significant purchase, NBTHK certification is the standard to hold out for.
How to Verify a Certificate Before You Buy
A genuine NBTHK certificate is not impossible to fake, but fakes are identifiable if you know what to look for. Here is the practical checklist we use when sourcing blades.
- Physical paper quality. NBTHK origami is printed on specific high-quality Japanese paper. Hozon certificates are yellow. Tokubetsu Hozon are brown. Neither should look like a standard printer output or photocopy. Any certificate presented as a color photocopy is an immediate disqualification, no exceptions.
- Seal and signature. Genuine certificates carry the official NBTHK seal (红印) and the signature of the head of the appraisal committee. Ask for a high-resolution scan of both.
- Certificate number. Every NBTHK certificate carries a unique registration number. For Juyo Token and above, the NBTHK maintains records that can be cross-referenced. For Hozon and Tokubetsu Hozon, ask the seller to confirm the number matches their records.
- Blade description match. The certificate describes the blade's characteristics: length (nagasa), curvature (sori), and identifying features. Request that the seller confirm these measurements match the physical blade before purchase.
- Token Toroku-sho present. Every legally registered sword in Japan has a government registration card (Token Toroku-sho). It should accompany the blade and the NBTHK certificate. If either is missing, ask why.
For more on pricing signals and what drives value across the different aspects of a nihonto, see our detailed breakdown of what actually makes a Japanese sword valuable.
Source: Unique Japan
Frequently Asked Questions
What does NBTHK Hozon mean?
NBTHK Hozon (保存刀剣) means a blade has passed the entry-level appraisal of Japan's foremost sword authentication organization and is certified as "Worthy of Preservation." It confirms the blade is genuine, the signature (if present) is authentic, and the blade has no disqualifying damage. Only about 2 in 10 submitted blades pass.
Does an NBTHK certificate prove a katana is authentic?
It is the strongest available authentication, but it is not infallible. The certificate describes the blade at the time of shinsa. Subsequent damage, repairs, or polishing may not be reflected. A genuine NBTHK certificate significantly reduces risk but does not replace a physical examination by a knowledgeable buyer or dealer.
How much does NBTHK certification add to a katana's value?
A certified Hozon Shinto katana typically sells for $4,000-12,000 versus $2,000-6,000 for an equivalent uncertified piece. Tokubetsu Hozon adds considerably more, often pushing a Shinto blade to $12,000-40,000. Juyo Token blades rarely appear below $50,000, regardless of period.
How long does it take to get NBTHK certified?
The NBTHK holds shinsa (appraisal sessions) periodically throughout the year. From submission to receiving a result typically takes 3 months to over a year, depending on the session schedule and the complexity of the appraisal. There is no expedited process.
What is the difference between NBTHK and NTHK certification?
Both are legitimate authentication organizations. The NBTHK (founded 1948) is the primary and most widely recognized, commanding higher market premiums. The NTHK-NPO is a separate body whose certificates are respected but generally carry less weight among serious collectors and at auction. When buying investment-grade nihonto, NBTHK certification is the standard.
Are old Kicho and Tokubetsu Kicho certificates still valid?
No. Certificates issued under the pre-1982 system (Kicho, Tokubetsu Kicho, Koshu Tokubetsu Kicho) are no longer valid as current authentication guarantees. The NBTHK has recommended that owners re-submit blades carrying these certificates for evaluation under the current system. Treat them as equivalent to no current certification.
Can NBTHK certificates be faked?
It happens, but genuine certificates have identifiable characteristics: specific paper quality and color, official NBTHK seal, committee signature, and a unique registration number. Any certificate presented as a photocopy should be rejected immediately. For Juyo Token and above, the NBTHK maintains records that can be cross-referenced.
Key Takeaways
- The NBTHK is the global standard for nihonto authentication, and passing even the entry-level Hozon certification is genuinely difficult. A Hozon cert means something.
- Each certification level represents a meaningful step up in both quality criteria and market value, from the $4,000-12,000 range for Hozon Shinto blades up to six-figure territory for Juyo Token pieces.
- Old pre-1982 certificates (Kicho, Tokubetsu Kicho) are not reliable authentication tools. They should be re-evaluated under the current system before being used as a purchasing basis.
- A certificate describes the blade at the time of shinsa. Verify it physically matches the blade, confirm all supporting documentation including the Token Toroku-sho, and never accept a photocopy.
For a broader look at the factors that determine what any given nihonto is worth, our guide on what actually makes a Japanese sword valuable covers period, smith attribution, condition, and koshirae in detail. And if you want to understand how certification intersects with the risk of buying fakes, see our breakdown of real vs fake antique katana red flags.
View NBTHK-Certified Katana in Our Collection