# On paper, a sword is three numbers and a seal > In Japan a blade is legal to possess only with its registration certificate, examined by the prefectural Board of Education, and it travels with the sword rather than the owner. August 20, 2026 · https://justog.club/stories/every-sword-has-a-certificate A folded sheet of paper, ruled into a column of narrow fields. Every label is there — length, signature, distinguishing features — and every field is an empty ruled box, except three: `68.2 cm`, `2.1 cm`, `1965`. A vermilion seal, slightly smudged, overlaps one corner. That blank form is the actual subject here. Not the temper line, not the fittings — the paperwork that decides whether any of it can legally exist in someone's home. ## Why does a sword need a certificate at all? Because in Japan, possessing an unregistered blade is a criminal offence, and the certificate is what makes possession legal. Under the law governing swords in Japan, a blade can be lawfully held only with a registration certificate issued for that specific sword. Without one, holding the blade is against the law regardless of who made it, how old it is, or how it came into someone's hands. ## Who decides whether a registration is granted, and what gets recorded? The prefectural Board of Education, not a court or a police department. Each application is examined by the Board of Education for the prefecture where the sword is presented, and what gets recorded is exactly what appears on the certificate: the blade's length, its signature if it has a legible one, and its distinguishing physical characteristics — the same three things [a restorer would be looking for once the tang is exposed](/stories/the-signature-on-the-tang). A blade without a legible signature can still be registered; the field for it is simply left blank, which is exactly what this particular certificate shows. ## Why does the certificate travel with the sword rather than the owner? Because the sword is what the system is tracking, not whoever happens to be holding it. Selling a registered blade or passing it down doesn't generate a new certificate — the same document moves with the sword to its new owner, still describing exactly the object in front of them. Ownership changes; the paperwork stays attached to the blade for as long as the blade exists. ## Can I reproduce a real certificate's layout for a shirt? The blank form, yes. One real sword's actual filled-in entries, no. A ruled field layout — the categories a registration examines, the general shape of a Japanese bureaucratic form — is a format, and formats aren't owned the way one specific document is. What isn't free to take is a particular blade's real recorded details: an actual certificate number, an actual owner's name, the exact measurements of one documented, identifiable sword. Those describe a real object and sometimes a real person. An invented sheet with invented numbers, which is what this design shows, sidesteps the question entirely. ## How many swords are actually registered like this? Roughly 2.3 million, nationwide. That's the scale of blades legally held in private and institutional hands under this system — not tallied by owner, but as one running total of certificates in circulation. Each began exactly like the sheet on this shirt: blank fields, examined once, then filled in with whatever could actually be verified about that specific blade. ## Does this apply if I don't live in Japan? To the design, yes. As legal advice about anywhere else, no. This registration system is Japanese law, specific to swords possessed inside Japan, and nothing here describes or substitutes for rules anywhere else a reader might be. [The blade this certificate would accompany carries its own separate record in the steel](/stories/the-hamon-is-a-record) and [its own decorated hardware](/stories/the-tsuba-is-the-only-jewellery) — this shirt is about the paperwork, in the one country it actually describes. ## Does it print well? Yes, since a form is naturally suited to flat colour and hard rules. Ruled lines, boxed fields and typewritten labels are already close to vector art: solid black rules, one or two greys for the paper's shading, and a single vermilion for the seal. The one thing to get right is the seal itself — it needs to look stamped rather than printed, which means an uneven edge and patchy coverage rather than a perfect circle of flat colour. ## How do I get one made? Describe the certificate at [JustOG](/) — how many fields, which ones are filled in, and what the seal looks like. Pick a direction, drag the crop frame, see it composited on the real garment, and it's made to order and shipped. Designs other people have published are in the [shop](/shop). Whatever gets filled into those boxes will outlive whoever's holding the pen.