What Is Suriage? 磨上げ — Shortened Tangs & Lost Signatures
Suriage (磨上げ) is the shortening of a Japanese sword from the tang end, removing part of the nakago to reduce the blade's overall length. Over the centuries countless long tachi were cut down to suit changing fashion, combat needs, or later mounting as katana — and because the tang is where the signature sits, suriage frequently removes the smith's mei. When a blade is heavily shortened it is called o-suriage (大磨上げ), and the original signature is almost always lost.
For a collector, suriage is one of the first things to read on a tang. It affects a blade's proportions, its signature status, and its value — and recognizing it, or its absence, is a core skill of authentication.
Why swords were shortened
Suriage was practical, not vandalism. Long Kamakura and Nanbokucho tachi — some well over 80 cm — were shortened as sword-wearing shifted from slung tachi to thrust-through katana during the Muromachi and Edo periods. A blade might be trimmed to a legal or regulation length, to balance better in the hand, or to fit new koshirae. The workshop cut away the lower tang, forged a new tang end, and re-fitted the sword. Elegance was sacrificed to keep a valued blade in service.
How to recognize suriage
Shortening leaves tell-tale marks on the nakago. Look for:
- Machi-okuri (区送り) — the notches (hamachi and munemachi) that mark the start of the cutting edge have been moved up the blade, so the tang is longer relative to where the edge now begins. Displaced machi are a classic sign the blade was shortened.
- Extra or relocated mekugi-ana (目釘穴) — the peg hole is drilled where the new tang length requires it. A shortened blade often shows a second, later hole, sometimes with an original hole now partly cut away at the tang tip.
- Altered nakago-jiri (茎尻) — the tang tip is re-shaped and re-filed when the old end is cut off. On a suriage blade the patina at the tip is often younger than the patina higher up the tang.
- Interrupted or reworked yasurime (鑢目) — the file marks may change direction or freshness where the new tang work meets the old, and older file marks can end abruptly.
- A mei sitting low or partly cut — occasionally a shortened blade retains part of a signature; a mei running off the end of the tang, or a machi-okuri mei, points to suriage.
Suriage vs. o-suriage vs. ubu
The degree of shortening matters:
- Ubu (生ぶ) — an original, unaltered tang that has never been shortened. The most desirable condition; if signed, the mei is intact.
- Suriage (磨上げ) — modestly shortened. The signature may survive if it sat high on the tang.
- O-suriage (大磨上げ) — heavily shortened, the tang cut down so far that the mei is lost. Very common on great koto tachi, which is why so many are mumei (unsigned) today.
What suriage means for value
Suriage is not automatically a defect. For an important koto blade, o-suriage is expected and forgiven — the market accepts that a 700-year-old tachi cut down for later use has lost its mei, and prices it on quality and attribution rather than the missing signature. A mumei o-suriage blade with strong NBTHK papers can be extremely valuable.
All else equal, though, an ubu blade with its original signature intact is worth more than a shortened one, because it retains its full history and proportions. The buyer's task is to distinguish honest, well-executed suriage from clumsy alterations, and to make sure any surviving mei has been authenticated rather than assumed. When in doubt, read the nakago and rely on papers.
Frequently asked questions
What is suriage on a Japanese sword?
Suriage (磨上げ) is the shortening of a sword from the tang end, cutting away part of the nakago to reduce the blade's length. Because the signature sits on the tang, suriage often removes the smith's mei, especially when the blade is heavily shortened (o-suriage).
How can you tell if a blade has been shortened?
Look at the tang for moved notches (machi-okuri), extra or relocated peg holes (mekugi-ana), a re-shaped tang tip (nakago-jiri) with younger patina, and file marks that change where new work meets old. A signature running off the end of the tang is another sign.
Does suriage lower a sword's value?
Not necessarily. For important koto blades, heavy shortening (o-suriage) is expected and forgiven, and value rests on quality and attribution. All else equal, an ubu blade with its original signature is worth more, but a papered o-suriage masterwork can still be extremely valuable.
What is the difference between suriage and o-suriage?
Suriage is modest shortening, where a high-set signature may survive. O-suriage is heavy shortening that cuts the tang down so far the original mei is lost, which is why so many great old tachi are now unsigned (mumei).