---
title: "Genroku Koban"
url: "https://ittendo.com/en/coinpedia/edo-gold-005-genroku-koban"
site: "ITTENDO"
type: "coinpedia"
category: "edo-gold"
series: "Edo Gold Coins"
lang: "en"
---
# Genroku Koban

> Conclusion: The Genroku Koban, a low-purity coin issued due to the shogunate's financial difficulties, is a highly valued collector's item due to its rarity and historical significance.

- 時代: 江戸
- 素材: 金
- 額面: 両 / 分 / 朱
- 発行量: 希少
- 価格帯: 高額

## Background and Purpose of the Genroku Recoinage

In Genroku 8 (1695), under the reign of Tokugawa Tsunayoshi, the fifth shogun of the Edo shogunate, the Genroku Koban (元禄小判) was born through a currency recoinage led by Commissioner of Finance Ogiwara Shigehide. The primary purpose of this recoinage was to overcome the shogunate's fiscal difficulties. Repeated disaster relief efforts, large-scale construction of temples and shrines, and expenditures associated with the question of the shogun's heir had accumulated, plunging the shogunate's finances into a serious state.

The Keichō Koban (慶長小判), the principal currency of the time, had established stable credibility with a gold purity of 84%. However, Ogiwara Shigehide proposed dramatically lowering the gold purity of this currency and using the resulting profit margin — known as "deme (出目)" — as shogunate revenue. This is said to have succeeded in generating an enormous temporary income in a short period of time. This policy has been evaluated as Japan's first full-scale transition toward a managed currency system, or as an attempt at an inflationary policy, and it exerted a major influence on Japan's subsequent monetary economy.

Among the background factors behind the recoinage was also the declining trend in Keichō Koban production. As gold output from the mines decreased and the supply of circulating currency began to run short, the need to increase the money supply was also recognized. The minting of the Genroku Koban was not limited to mere fiscal supplementation — it also carried the aspect of stimulating monetary circulation. This complex background makes the historical significance of the Genroku Koban all the more profound.

## Ogiwara Shigehide's Economic Policy and Historical Evaluation

Ogiwara Shigehide (1658–1713), who led the Genroku recoinage, was an outstanding fiscal bureaucrat representative of the mid-Edo period. He confronted the shogunate's fiscal crisis with the bold method of currency recoinage. By lowering the gold purity from the Keichō Koban's 84% to 57% in the Genroku Koban, records indicate that he brought the shogunate a temporary income of approximately 5,000,000 ryō. This was an enormous sum equivalent to several years of the shogunate's revenues at the time, and it succeeded in temporarily restoring the finances.

However, this policy triggered a surge in prices that struck directly at the lives of ordinary people. As the purchasing power of currency declined, the prices of daily necessities including rice rose, causing great turmoil in society. In response to this situation, the Confucian scholar Arai Hakuseki harshly criticized it as "the worst governance under heaven." Hakuseki argued that debasing the purity of currency was an act that would forfeit the trust of the state and undermine long-term prosperity. Shigehide was later ousted from office, and the purity was restored in the Shōtoku recoinage.

Among modern economists as well, evaluations of Ogiwara Shigehide remain divided. Some voices praise the aspect in which, as a form of "monetary easing" accompanied by inflation, it stimulated the economy and supported the flourishing of Genroku culture. On the other hand, the view that it was a harmful policy that robbed ordinary people of their purchasing power and invited social unrest also persists strongly. His policy continues to be studied as an extremely important case for considering the effects that currency purity has on an economy. For an overview of Edo-period gold coins as a whole, please refer to [Edo Gold Coins (Koban and Ōban) Introduction](/coinpedia/edo-gold-001-overview).

## Physical Characteristics of the Genroku Koban

The Genroku Koban has clear differences from the preceding Keichō Koban in its physical characteristics. First, its weight is 17.82g (4 monme 7 bu 1 rin), nearly the same as the Keichō Koban. However, the most notable difference lies in the gold purity: the Genroku Koban was set at 57.4% (silver 42.6%), a substantial reduction from the Keichō Koban's 84%. This decline in purity directly affected the color of the koban's surface.

Compared to the deep and beautiful yamabuki (golden yellow) color of the Keichō Koban, the Genroku Koban, due to its increased silver content, has a slightly reddish hue. This is because, while pure gold is yellow in color, silver is whitish, causing the color of the alloy to change depending on the ratio. A skilled appraiser can identify this subtle difference in color through visual inspection.

On the reverse, the "元" seal stamp is struck, indicating that it is a Genroku Koban. This "元" seal stamp is an identifying mark unique to the Genroku Koban not found on other koban, and it serves as an extremely important clue in authentication and type identification. The minting period spanned approximately 15 years from Genroku 8 (1695) to Hōei 7 (1710), during which large quantities of Genroku Koban were minted and circulated throughout Japan. For a more detailed look at the various types of koban, please see [Types and Price Ranges of Koban](/coinpedia/edo-gold-002-koban-types).

## Detailed Comparative Specifications: Gold Purity, Weight, and Dimensions

The precise specifications of the Genroku Koban are: weight 17.82g (4 monme 7 bu 1 rin), gold purity 57.4% (silver 42.6%). Its size was approximately 73mm in length by approximately 40mm in width, maintained at nearly the same dimensions as the Keichō Koban. However, the pure gold content comes to approximately 10.2g, compared to the Keichō Koban's approximately 14.9g — a reduction of approximately 32% in pure gold content. This large difference in pure gold content is one of the factors that determines the historical and economic significance of the Genroku Koban.

The change in color resulting from the decline in purity is an important identification point for collectors. Compared to the vivid yamabuki color of the Keichō Koban, the Genroku Koban, due to its higher silver ratio, appears slightly reddish or dull gold. This is also influenced by the fact that alloys of copper and silver tend to oxidize easily, causing the color tone of the surface to change over time. This difference in color is one of the important indicators relied upon by skilled appraisers when distinguishing the authenticity and type of old coins.

In terms of minting technology as well, the high level of currency manufacturing technology of the time can be glimpsed. While lowering the purity, efforts were made to maintain the weight and dimensions so as to preserve visual continuity and facilitate public acceptance. However, this reduction in purity ultimately also led to the shaking of confidence in the currency. Detailed knowledge of these specifications is also indispensable as a countermeasure against counterfeits.

## Impact on Genroku Culture and the Economy

While the Genroku recoinage brought severe inflation as an economic side effect, it was not unrelated to the flourishing of Genroku culture. The increase in money supply temporarily stimulated economic activity and brought wealth especially to the merchant class in urban areas. This new wealthy class became the bearers of cultural consumption, supporting the blossoming of the rich popular culture today called "Genroku culture" — including Matsuo Bashō's haiku, Ihara Saikaku's ukiyo-zōshi, and Chikamatsu Monzaemon's puppet theater (ningyō jōruri).

In urban areas, commerce developed and consumer activity became more vigorous. As a result, ukiyo-e, kabuki, and haiku took root as popular entertainment, and diverse cultures were cultivated. The spread of monetary economy also brought changes to people's lifestyles and values, creating fertile ground for a more hedonistic and worldly culture to flourish. However, this economic prosperity rested upon the price paid in the form of currency devaluation resulting from the decline in purity.

In the long term, inflation squeezed the lives of ordinary people and resulted in widening disparities between rich and poor. As confidence in currency wavered and economic instability progressed, social contradictions accumulated. These contradictions became an important foreshadowing leading to the Kyōhō Reforms under Tokugawa Yoshimune. The economic "light and shadow" brought about by the Genroku recoinage is also a suggestive case for understanding [How to Read Old Coin Market Cycles](/coinpedia/basics-005-market-cycles).

## Rarity and Market Value of the Genroku Koban

The Genroku Koban holds high rarity in the old coin market due to its historical background and relatively small number of surviving examples. In particular, large quantities of Genroku Koban were collected during later recoinages of the Hōei Koban (宝永小判) and Shōtoku Koban (正徳小判) and reused as material for new currencies. For this reason, the number of individual pieces circulating in the market is limited compared to the Keichō Koban and Kyōhō Koban.

The high level of rarity is directly reflected in market prices. In particular, for pieces in the extremely fine (極美品) class with exceptionally good preservation, auction results exceeding 10,000,000 yen have been confirmed, and their value is on an upward trend year by year. This is because historical value and artistic value are evaluated together.

Collecting Genroku Koban carries the attractive aspect of not only investment but also engagement with the economic and cultural history of the Edo period. Due to the small number of surviving examples, the frequency of market appearances is limited to a few pieces per year, and when a well-preserved example is offered, fierce competition unfolds among collectors both domestically and internationally. For a deeper exploration of the diverse factors that determine the value of old coins, please see [Factors That Determine the Value of Old Coins](/coinpedia/basics-001-value-drivers).

Individual prices and auction results are listed only once verifiably matched records — with sale, lot, source URL and review date — exist.

## Major Auction Results and Price Trends

The market value of the Genroku Koban can be concretely understood from recent major auction results. At a domestic auction in 2019, a fine-condition (美品) example in good condition sold for 2,800,000 yen. Furthermore, in 2022, an extremely fine (極美品) class example with exceptionally superior preservation was hammered at 7,200,000 yen, with high-value transactions continuing. These examples demonstrate that the Genroku Koban is an investment asset with stable demand.

Due to the small number of surviving examples, the frequency of market appearances is extremely limited to approximately 3 to 5 pieces per year. As a result, when a well-preserved example is offered, fierce bidding competition develops among collectors and investors, and prices tend to surge. In particular, "slabbed" pieces that have undergone third-party grading by organizations such as PCGS or NGC are increasingly being hammered at prices exceeding domestic market rates at overseas auctions as well, due to their high reliability.

At ITTENDO, we track past auction hammer records in detail and analyze market trends. The price of the Genroku Koban fluctuates depending on economic conditions and the breadth of the collector base, but due to its historical significance and rarity, it is predicted to maintain stable value going forward. For information on how to acquire old coins through auctions, please see [Introduction to and Practical Use of Old Coin Auctions](/coinpedia/basics-007-auction).

## Comparison with Successor Currencies and Historical Significance

The Genroku Koban occupies an important position in the history of currency recoinages throughout the Edo period.

Meanwhile, the Shōtoku Koban (正徳小判, 1714), which appeared after the Hōei Koban, was a piece in which the weight was restored to the same level as the Keichō Koban through the strong advocacy of Arai Hakuseki (catalogue). This purity was comparable to the Keichō Koban, and it aimed at restoring confidence in the currency. The subsequent Kyōhō Koban (享保小判, 1715) also maintained high purity (catalogue: purity approximately 87%).

The Genroku Koban holds its own unique historical significance as the very representative example of the "era of purity decline" in the Edo period, continuing from the Keichō Koban through to the Hōei Koban. The existence of this koban clearly illustrates the conflict that arose between the shogunate's fiscal policy and the economy of ordinary people, as well as the turning point in subsequent monetary policy. By comparing the historical background and market prices of each koban, one can more deeply understand the complex economic history of the Edo period. The contrast is especially striking when compared with [Explanation and Market Prices of the Keichō Koban](/coinpedia/edo-gold-009-keicho-koban).

Individual prices and auction results are listed only once verifiably matched records — with sale, lot, source URL and review date — exist.