TL;DR: Obi almost never carry a date, a label or a maker’s mark, so dating one means reading the cloth. Fibre gives you the widest cut — a synthetic obi is post-war, usually 1970s or later. Metallic thread, weave density, construction and palette narrow it further. What you can honestly conclude is a range of decades, and any listing that names a single year without a certificate or a weaver’s mark is telling you a story rather than a fact. We grade our own pieces to a range and say so.
Every obi we list carries an era in its description, and every one of those eras is a judgement. It is worth explaining how the judgement is made, because it tells you what to pay for and what to ignore.
What the era names actually mean#
Japanese sellers date textiles by imperial era, so international dealers inherited the vocabulary. The dates:
| Era | Years | What you typically see in obi | |—|—|—| | Meiji | 1868–1912 | Hand-weaving throughout, natural and early chemical dyes, heavy gold-leaf-on-paper thread, dense formal brocade | | Taisho | 1912–1926 | Western influence in the palette and geometry, Art Nouveau and early Deco motifs, broader colour range as synthetic dyes spread | | Showa | 1926–1989 | The widest bracket by far. Pre-war work resembles Taisho; post-war work brings power looms, then synthetic fibre from the 1970s | | Heisei | 1989–2019 | Mostly machine-woven, often polyester, formal pieces still silk | | Reiwa | 2019– | Contemporary production |
Two things follow from that table. First, cloth does not change on the day an emperor dies, so era boundaries are conventions and a piece near a boundary can honestly be assigned to either. Second, “Showa” covers sixty-three years and a complete change in manufacturing, which is why it is the least useful single word in this market. A good listing says late Showa or pre-war Showa.
The dating sequence: five checks, widest cut first#
Work in this order. Each check narrows the window, and a later check never overrides an earlier one — if the fibre says synthetic, the motif cannot make the piece Taisho.
1. Fibre#
This is the biggest single cut you can make. Synthetic fibre in Japanese obi becomes common from the 1970s, so a polyester obi is almost certainly late Showa or newer. Silk is compatible with every era and therefore tells you nothing on its own, but it keeps the older windows open.
The four home tests — hand feel and warmth, the slip test, the crush test, and the burn test on a single thread from a hidden edge — are set out in our guide to telling silk from polyester. Do this first. It takes two minutes and it decides whether the rest of the exercise is worth doing.
2. Metallic thread#
Gold and silver passages age in a way the surrounding silk does not, and how they are made changes over time.
- Foil on a paper core is the traditional construction: thin metal leaf laid on washi and cut into fine strips, then wound around a silk core. Under magnification it reads as a wrapped ribbon with a visible seam, and it catches light directionally rather than evenly. Paper-core thread also ages visibly — it can darken, and the wrap can lift at abrasion points.
- Foil on a film core replaces the paper with a polyester film. It is brighter, more uniform, and far more resistant to tarnish. It belongs to the later part of the Showa era onward.
- A flat metallic yarn with no wrap is a later and cheaper substitute again.
A piece with visibly tarnished, paper-cored gold that shows honest wear at the folds is arguing for an older window. Uniform, untarnished brightness argues for a newer one.
3. Weave and loom#
Hand-weaving and power-weaving leave different evidence. Hand work has slight irregularities: a pick that sits marginally out of line, small variations in density across a repeat, selvedges that are not perfectly even. Power-loom cloth is regular in a way that starts to look mechanical once you have compared the two.
This is also where weave family matters. Formal brocade, tapestry weave and gauze all persist across eras, so the weave type does not date a piece by itself — but the fineness of the work and how many colours meet cleanly along thread lines both tell you how much loom preparation the piece justified. Our explanation of what Nishijin-ori is covers why pre-dyed yarn weaving behaves this way.
4. Construction and format#
The obi type itself is a dating clue, because the formats were standardised at different times. The nagoya obi is a twentieth-century invention, designed for speed of tying, so a nagoya obi cannot be Meiji. Hanhaba obi in synthetic fabric are overwhelmingly modern. A full-length fukuro obi is the most era-ambiguous of the three, which is why most vintage pieces sold as decor are fukuro. The differences between the three formats are in our guide to fukuro, nagoya and hanhaba.
Other construction signals worth checking: hand-stitching with slight irregularity rather than perfectly uniform machine seams; any hidden snap or hook-and-loop fastening, which places a piece firmly in the modern export era; and the presence of any tag at all, which is more common on recent pieces than on genuinely old ones.
5. Palette and motif#
Least reliable, most often quoted. Traditional motifs — crane, pine, chrysanthemum, plum — run continuously across every era and prove nothing about age. What can help is the combination: Art Nouveau curves and early Deco geometry point at Taisho and pre-war Showa; very saturated, high-contrast colour points at the post-war synthetic dye period; muted, slightly uneven tones are consistent with older dyeing but are also what fading looks like. If you want the vocabulary, our guide to Japanese textile motifs covers what the symbols mean.
A worked example#
Take a piece with these findings: silk by burn test, gold thread on a paper core with mild tarnish at the fold lines, a very dense brocade with many colours meeting cleanly, fukuro format, no tag, no maker’s mark, a classical crane-and-pine motif in muted tones.
The honest conclusion is pre-war to mid Showa, possibly Taisho, cannot be narrowed further without a mark. That is a forty-year window. It is also all the evidence supports, and anyone who writes “Taisho, circa 1920” on that piece has converted an inference into a claim.
What to distrust in a listing#
- A single year. Without a weaver’s certificate or a dated box, nobody can date an obi to a year from the cloth.
- “Antique” applied to anything. In practice the trade treats pre-1930s work as antique and later work as vintage. A 1975 polyester obi described as antique is a pricing move.
- An era with no supporting detail. If the listing names Taisho but says nothing about fibre, thread or weave, ask which of those it is based on.
- Age quoted as the reason for the price. Condition and weave quality do more for what a piece is worth than its decade does.
What we do#
Every KINU Tokyo piece is handled in Tokyo before it is listed. We check fibre, examine the metallic thread, look at the reverse for the weave structure and for hidden staining under the folds, measure the piece, and grade the condition. Then we assign the widest era range the evidence supports and put it in the listing. Both pieces currently in the shop are described as late Showa, because that is what the cloth says — silk brocade with metallic threadwork, in formats and condition consistent with the mid-to-late twentieth century.
If you are choosing between pieces, the era is worth much less than the condition report next to it. Our complete guide to vintage obi as home decor covers what actually changes the price, and every obi in the KINU Tokyo shop is listed with its fibre, era range, exact dimensions and disclosed defects.