Ansei Nibus Gin — A Silver Coin Born Amidst Port Opening and Fiscal Crisis

In 1858, the shogunate signed the Treaty of Amity and Commerce with the United States, leading to the opening of major Japanese ports including Yokohama. This opening resulted in a massive influx of foreign products into domestic markets, causing a rapid outflow of silver coins. The shogunate's finances became strained, necessitating measures to address the situation. At this time, the financial affairs of the shogunate were overseen by Senior Councillor Hotta Masayoshi. He decided to issue new currency to prevent the outflow of silver while supplementing finances. This was the Ansei Nibus Gin. The Ansei Nibus Gin held a value of 2 bu, equivalent to 0.5 ryō, and was introduced into the market as a subsidiary silver coin. Through this, the shogunate attempted to protect domestic silver resources and stabilize the economy. However, the issuance of this silver coin was not merely a fiscal measure but symbolized the shogunate’s struggles amid international economic competition due to port openings. At the time, foreign silver coins, particularly the Mexican dollar, circulated within Japan, and Ansei Nibus Gin was issued to compete with these. For the shogunate, introducing this silver coin was a desperate measure to stabilize the domestic economy and part of the trial and error in port opening policy.

The minting of Ansei Nibus Gin was conducted at the Kinza and Ginza, which were responsible for coin production during the Edo period. Kinza was managed by the Gotō family, while Ginza was managed by the Mitsui family, and Ginza was involved in the minting of Ansei Nibus Gin. Ginza was located in Honjo, Edo, bringing together skilled craftsmen with precise minting techniques. Manufacturing the Ansei Nibus Gin required higher techniques than usual silver coins. Considering the competition with foreign silver coins, it was necessary to ensure intricate design and high silver purity. The silver used as raw material was supplied from Sado mines and Iwami mines managed by the shogunate. These resources were crucial for supporting the shogunate's fiscal base, and their high quality upheld the reliability of Ansei Nibus Gin. The minting process involved melting the silver, pouring it into molds, and cooling it. Craftsmen utilized advanced techniques and experience to fulfill the challenging task of minting a large number of silver coins in a limited time. The issuance of Ansei Nibus Gin was a maneuver by the shogunate to escape fiscal adversity, and it was underpinned by excellent craftsmanship and the efforts of craftsmen in the Edo period. This minting technique later influenced detailed Keichō Koban and modern coinage.

Once Ansei Nibus Gin was issued, its circulation began primarily in major markets. In major cities like Edo and Osaka, merchants were particularly keen to test the value of this new silver coin. However, in actual circulation, competition with foreign silver coins was intense, and since the exchange rate with the Mexican dollar was unstable, merchants handled it cautiously. Although the shogunate temporarily succeeded in curbing silver outflow through the circulation of this silver coin, its long-term effect was limited. The economy at the time was rapidly changing due to the impact of international trade post-port opening, leading to value fluctuations not only in silver coins but also in gold and copper coins. Among the common people, Ansei Nibus Gin was rarely used in daily transactions, mainly handling major commercial transactions and as gifts. However, the stabilization measure aimed by the shogunate is said to have had little impact on the lives of the common people. On the other hand, merchants and wealthy individuals attempted to profit from the introduction of new currency, yet were dissatisfied with excessive restrictions in the form of rate differences and circulation constraints with foreign currencies. Thus, while Ansei Nibus Gin played a limited role amid the tumultuous economic environment of the closing Edo period, it provided a subtle balance in society. This experience served as a lesson in later value and identification of modern coins.

In Meiji 2 (1869), Japan aimed to modernize its monetary system, abolishing Edo-period currency including Ansei Nibus Gin. Consequently, Japan introduced a modern monetary system, and yen was issued as new currency. Through this reform, Ansei Nibus Gin ended its short circulation period, becoming part of history. Nonetheless, Ansei Nibus Gin played an important role in Japanese monetary history. It held value as an example of how to reconcile traditional systems with new international environments during the port-opening policy and fiscal crisis in the closing years of the Edo period. The experiences of issuing and abolishing this silver coin later became crucial lessons when Japan faced internationalization of currency and economic reforms. Today, Ansei Nibus Gin holds high value among antique coin collectors due to its rarity. The short circulation period and designs reflecting the economic situation of Japan at the time are appreciated, making it a valuable piece for collectors who feel the history of Japan. In this way, Ansei Nibus Gin holds significance beyond that of mere currency, drawing particular attention in basic knowledge of antique coin auctions.