---
title: "Kaeie Ōban Value and Identification Guide: An Introduction to the Last Ōban of the Bakumatsu Era"
url: "https://ittendo.com/en/article/news-jp-1374-5dccff44"
site: "ITTENDO"
type: "article"
category: "江戸金貨"
published: "2026-09-05T22:00:00Z"
source: "一点堂編集部"
source_url: "https://ittendo.com/"
lang: "en"
---
# Kaeie Ōban Value and Identification Guide: An Introduction to the Last Ōban of the Bakumatsu Era

> The Kaei Ōban (嘉永大判) is a large gold coin minted by the Edo Shogunate between 1848 and 1854, a product of the turbulent Bakumatsu period that coincided with Commodore Perry's arrival. Surviving examples are estimated at only dozens of pieces, making the authenticity of the ink inscriptions the single most critical point in authentication. With bullion value alone exceeding ¥1,200,000, this ultra-rare coin trades on the market for tens of millions of yen.

In Kaei 6 (1853), the very year the Black Ships arrived, a ōban was minted. That coin is the Kaei Ōban (嘉永大判). Born amid the political turmoil and fiscal crisis of the final days of the Edo Shogunate, this gold coin survives in extremely small numbers and is recorded as an ultra-rare piece occupying the pinnacle of Edo-period numismatic collections.

---

## The Last Ōban of the Bakumatsu Era — What Is the Kaei Ōban?

The Kaei Ōban (嘉永大判) is the collective name for ōban minted during the Kaei era (1848–1854), the final period of the Edo Shogunate. This was the eve of the turbulent Bakumatsu, when Japan's policy of national seclusion began to shake to its very foundations. In the sixth month of Kaei 6 (1853), Commodore Matthew Perry's Black Ship fleet arrived off Uraga, forcing the Shogunate to confront the question of opening the country.

The Kaei Ōban, minted amid this political turmoil and fiscal deterioration, represents the final stage of ōban production that had continued since the Tenpō era (1830–1844). Some specialists regard the ōban of this period as a continuation of the Tenpō Ōban (天保大判) series, and classification differs depending on the specialist catalogue consulted. However, because the number of coins minted was extremely limited against the backdrop of Bakumatsu upheaval and surviving examples are rare, there is a growing tendency within the collector community to evaluate the Kaei Ōban as an independent category.

The Kaei Ōban shares the elliptical plate-shaped gold coin form common to all Edo-period ōban. Its large size of approximately 175 mm in length by 105 mm in width carries the dignity befitting the ōban lineage, and its weight (ryōme) is approximately 165 g. Gold fineness is estimated at approximately 65–73%, and many confirmed examples share a fineness similar to that of the preceding Tenpō Ōban.

On the obverse, the inscription「拾両後藤（花押）」is written in ink, along with the signature of Kōji. The Kōji kao (花押) was applied by the Gotō family and is a crucial element indicating official recognition of the coin. On the reverse, the assayer's stamp (fukiya gokuine) and a stamp corresponding to the era year are engraved.

Based on the current gold price (approximately ¥13,000 per gram), the bullion value alone exceeds ¥1,200,000; however, the market valuation as an ultra-rare piece far surpasses this figure. For an overview of the entire system of Edo gold coins, please also refer to [Introduction to Edo Gold Coins (Koban and Ōban)](/coinpedia/edo-gold-001-overview).

## Succession from the Tenpō Ōban and Its Position within the Bakumatsu Economic Crisis

To understand the Kaei Ōban, one cannot avoid the relationship with the preceding [Tenpō Ōban (天保大判)](/coinpedia/edo-gold-015-tempo-oban). Minting of the Tenpō Ōban began in Tenpō 8 (1837) and continued through the Bakumatsu period, but among examples from the Kaei and Ansei eras there are pieces whose period of minting can be identified from characteristics of the stamps and inscriptions.

In terms of classification, the treatment of the Kaei Ōban is not uniform. Some catalogues lump it together with the Tenpō Ōban, while multiple authoritative works list it separately as a distinct "Kaei Ōban." This difference is not merely a matter of classification; it directly affects current collector valuations. Examples that can be identified as minted in the Kaei era and after are recognised as carrying a special rarity, and combined with their historical background, they are in practice treated as being in a class of their own. Until the [Manei Ōban (万延大判)](/coinpedia/edo-gold-008-manen-oban) appeared as a successor in Man'en 1 (1860), the Kaei Ōban occupied precisely a bridging position.

The Shogunate's finances during the Kaei era faced a grave crisis. Repeated recoinage had caused monetary devaluation, expenditure on coastal defence against foreign vessels was rising, and the contradictions of the bakuhan system were acting in combination. Perry's arrival in Kaei 6 further deepened this situation.

During the negotiations over opening ports and the country, the problem of the gold-to-silver exchange ratio came to the fore. Japan maintained a ratio of 1 gold to 5 silver, whereas on international markets the ratio was approximately 1 gold to 15 silver. Immediately after the opening of the country, the mass outflow of gold coins by foreign merchants exploiting this price differential became a serious problem. To address this "gold outflow problem," the Shogunate carried out a major recoinage in Man'en 1 (1860), producing the Man'en Nishu-kin, Man'en Koban, and Man'en Ōban. The minting of the Kaei Ōban falls in the period immediately before that, the final phase during which the old system was being maintained while the Shogunate struggled with fiscal hardship. It is thought that this temporal positioning led later recorders to recognise the Kaei Ōban as an independent classification.

## Recent Market Price Levels in the Edo Gold Coin Category

Looking at bidding trends across the entire Edo gold coin category, as of the reference date of 6 September 2026, the median for the most recent 90 days is ¥12,900 (1 transaction). The preceding 90-day period recorded ¥40,000 (5 transactions), making it appear at first glance that prices have fallen. However, because the sample size is small, the rate of change and reliability index have not been calculated.

Reviewing actual auction records reveals the background to this difference. The single transaction in the most recent 90 days is likely to have captured a lower-priced listing. In the preceding period, the notable results include the Man'en Koban-kin (万延小判金) at ¥100,000 on 18 April 2026, Man'en Kin San-ryō (万延金三両) at ¥35,000 on 12 April 2026, and old coins including a koban (古銭小判等) at ¥40,000 on 28 April 2026 — all relatively high prices within the category.

Even within the same category, the spread of hammer prices is wide, with transactions ranging from ¥500 to ¥100,000 on record. Listings of lower-denomination pieces such as ichibu-gin and ichibu-gin (一朱銀・一分銀) tend to settle in the ¥1,100–¥2,800 range, and these have not significantly skewed the recent median. Rather, it is the wide variation in price range depending on individual quality, inscribed year, and condition that produces the fluctuation in these figures.

When reading the market for the Kaei Ōban, it is necessary to recognise that the total number of transactions across the category is limited. As detailed in [Methodology and Sample Size for Market Calculation](/market/methodology), periods with fewer than 10 transactions serve only as a directional guide and are a separate matter from price formation that reflects differences by individual inscribed year and mint location.

## Authentication of the Kaei Ōban and Its Rarity in the Market

The greatest factors determining the value of the Kaei Ōban are the **high difficulty of distinguishing genuine from fake** and the **extremely small number of surviving examples**.

### Confirming the Ink Inscription and Gold Fineness Is the Key

The ink inscription applied to the Kaei Ōban is handwritten by Gotō family craftsmen, and confirming its authenticity is the single most critical point in appraisal. Genuine ink inscriptions more than 200 years old have soaked deeply into the surface of the gold, presenting a distinctive subdued black colour, whereas false ink inscriptions applied in later years show a floating, glossy appearance on the surface. By comprehensively judging the vigour of the brushwork, the shape of the characters, and the degree of ink penetration, it is possible to distinguish between the two.

Confirming the ryōme (weight) is also indispensable. Although there is individual variation in the ryōme of Kaei Ōban, any example that deviates greatly from the benchmark of approximately 165 g warrants caution. For high-value transactions, confirmation of gold fineness by X-ray fluorescence analysis is essential. Requesting appraisal from the JNDA or a specialist authentication body is an absolute requirement for transactions involving hundreds of thousands of yen or more.

### The Small Number of Surviving Examples Determines Value

The number of surviving Kaei Ōban is extremely small; examples in good condition that have been confirmed are said to number only dozens of pieces. This absolute scarcity of surviving examples is the greatest factor placing the Kaei Ōban at one of the summits of Edo-period numismatic collecting.

Listings on the market occur only once every several years, and since the 2020s, multiple auction results exceeding ¥10,000,000 have been confirmed regardless of condition. For examples of fine quality, results exceeding ¥20,000,000 are not unusual. As a practical matter, the only means of acquisition is either building a long-term relationship of trust with an established specialist dealer in old coins, or monitoring major auction houses.

## Points to Confirm When Acquiring or Holding a Kaei Ōban

The Kaei Ōban is a first-rate historical document representing the final stage of Edo-period gold coinage, and confirming the individual coin's condition and provenance greatly affects its value.

**Confirming the Inscribed Year and Reverse Characters**

Minting of the Kaei Ōban continued throughout the Kaei era. There are examples both with and without reverse characters (haiji); where reverse characters are present, they serve as an important clue indicating the mint location. Many examples on the market lack reverse characters, but examples bearing reverse characters have a clearer classificatory position, which enhances their reliability as documentary records.

**Quality and State of Preservation**

The Kaei Ōban is characterised by a high degree of material completeness as the final brilliance of a traditional monetary system spanning approximately 1,200 years. The extent to which the handwork of the Gotō family in the ink inscription and signature on the obverse, and the elliptical plate-shaped form, have been preserved varies greatly between individual examples. The presence, absence, and degree of scratches, wear, discolouration, and corrosion are indispensable for judging how reliable a given example is as a historical document. Whether a storage environment conforming to [Proper Storage Methods for Old Coins](/guide/storage) can be secured is also a factor to consider before acquisition.

**Records of Provenance**

Examples with clearly documented provenance — such as records of transactions between collectors, exhibition history, and the existence of certificates of authentication — tend to be more readily recognised in the market for their authenticity and value. In particular, examples that have been the subject of investigation by academic institutions or have been used as materials for academic presentations have an established position as first-rate primary sources in Japanese history and economic history.

By confirming these points in combination before purchase, one can judge not merely what kind of collectible item the example is, but what academic and historical value it carries.

## The Position of the Kaei Ōban in Bakumatsu Numismatic History

The Kaei Ōban is the "last ōban" minted by the Edo Shogunate during the period of turmoil on the eve of the opening of the country. Its historical context, overlapping with Perry's arrival, combined with the ultra-small number of surviving pieces, places it on record as an ultra-rare piece occupying the pinnacle of Bakumatsu numismatic collections.

The ōban as a form of coinage played only a limited role throughout the Edo period. Actual circulation was supported by koban and silver coins; the ōban held only symbolic value as a medium for large transactions and for presentation as gifts. Within that context, the Kaei Ōban represents the final minting as the Shogunate's economic crisis deepened — a relic that materialised a historical turning point.

The small number of surviving examples reflects not merely rarity but the political and economic conditions of the time. The extremely limited number of pieces minted in the first place, combined with the loss of many over more than a century of time, is strikingly evident in today's market records.

What ITTENDO considers essential to recognise is what historical moment the Kaei Ōban is a product of. It is not simply an old gold coin; it is a Bakumatsu physical document that existed within an extremely limited window of time, symbolising the transition from Edo to Meiji. Understanding this context is the path to knowing the true nature of this single coin.