Understanding Mei: Signature Markings on Japanese Katana Blades for Collectors

What is mei？

Mei refers to the text carved on the stem of the sword, which generally includes the swordsman and the year of making the sword. Mei is considered an important basis in the identification of Japanese swords and has significant significance for the period of activities and history of swordsmen. Mei is carved with a chisel struck by a hammer, etching text bit by bit on the surface of nakago.

To fully grasp all structural parts of nihonto, browse complete katana component reference hub. Mei engraving became popular from the late Heian period, formally regulated under the Taihō Code enacted in 701 AD. Swordsmiths used art names as their carving signatures, and these marks are often counterfeited by forgers. One smith may use multiple mei across different eras, while the same mei could be adopted by several generations of craftsmen.

Mei acts as the swordsmith’s unique signature. Paired with Yasurime file marks on nakago, collectors rely on both details to judge the age and value of antique blades. The nakago has two sides: omote (front) and ura (back). Katana and wakizashi carve smith info on omote and production dates on ura, while tachi follows the opposite rule. Mei length varies widely, ranging from single characters to full records of region, official title, smith name, test‑cut results and original owners, known as Saidanmei when chopping test data is included.

Certain mei lineages were passed down for dozens of generations, such as Kanefusa (23 generations in Meiji) and Kanesada Toku (11 generations), acting as hereditary trademarks for swordsmith families.

Types of mei

1. Tachi‑mei

Signatures are cut on the outer side of nakago for tachi, which were worn edge‑down slung on the waist. Most pre‑Muromachi period blades adopted this carving style.

2. Katana‑mei

After Muromachi, katana were worn edge‑up, so mei was carved on the reversed outer surface of tang. A typical omote mei reads "Bungo ju Fujiwara Saneyuki", recording the smith’s origin and name.

3. Omote‑mei

As marked (a) on the reference image above, omote‑mei is the outward‑facing surface of nakago, normally carved with the smith’s name, origin territory and honorary titles. Note that omote‑mei is not an independent mei type, it represents one side of the sword tang.

4. Ura‑mei

Shown as label (b) in the composite image, ura‑mei sits on the reverse side of the same nakago tang. It usually bears carving records of production year, date and supplementary notes. The layout between omote‑mei and ura‑mei is reversed for tachi versus katana.

5. Shu‑mei

Red lacquer appraisal signature added by professional nihonto authenticators.

6. Gaku‑mei

Relocated mei after a blade is shortened, with the signature steel block reattached to the trimmed nakago.

7. Orikaeshi‑mei

Folded‑over mei when only a small section of tang is trimmed, flipping original signature to the opposite side.

8. Kin‑mei

Luxury gold‑inlaid appraisal signatures embedded into nakago surface.

9. Held mei / Annotated mei

Carvings recording both swordsmith and later owner or customizer.

Fake pseudo‑mei are extremely common for famous smiths; distinguishing genuine signatures from counterfeits requires years of professional collecting experience. Many antique swords carry no mei at all, caused by unmastered craft, ceremonial dedication or unsatisfactory finished blades — a blank tang does not equal low‑quality work. Gakumei repair craft involves digging out flawed carved text and inlaying new steel blocks with revised signatures.

なかごおおすりあげ (Nakago‑o‑suri‑age)

Nakago‑o‑suri‑age describes the trimming and resurfacing of sword tangs, done to refit mounting fittings, match new carrying styles or shorten blade length. This modification often alters or removes original mei carvings, making identification more complex for modern collectors.

If you want to continue learning about other tsuka decorative hardware after understanding nakago mei, read katana menuki decorative metal fittings guide. To review the full collection of all katana component tutorials again, return to all nihonto part introduction hub.

For official standard identification materials of antique sword mei patterns, refer to resources published by authoritative Japanese institutions: The Japanese Sword Museum official research archives.