Former 20-Yen Gold Coin (Meiji 3) — The Highest-Denomination Gold Coin That Stamped Modern Japan's 'Gold Standard'

The Boshin War, ignited by the Battle of Toba–Fushimi in January 1868 (Keiō 4), continued for more than a year until the fall of Hakodate's Goryōkaku at the end of that same year. To finance the civil war, the new government issued large quantities of inconvertible paper currency known as Dajōkan-satsu (太政官札), deepening an economic turmoil that had persisted since the end of the Edo period.

Japan in the late Edo period already suffered severe monetary disorder. Domain notes issued independently by each han numbered in the hundreds of varieties, with differing fineness standards and exchange terms. The shogunate's traditional tri-metallic system of gold, silver, and copper coins—exemplified by the Keichō Koban (慶長小判), chōgin silver, and Kan'ei Tsūhō (寛永通宝)—had lost credibility following the reduction in gold fineness during the Man'en recoinage of 1860. After the Ansei period, when foreign trade commenced, Mexican silver coins and foreign gold coins also flowed into the country, further complicating the monetary system.

Young officials of the Ministry of Finance (Ōkurashō, established in 1869, Meiji 2), who managed the new government's finances, envisioned a 'Western-style unified monetary system' as the solution to this disorder. Their principal references were the American gold coin system and the European gold standard. Three pillars underpinned the plan: a decimal system that would eliminate complex exchange calculations, a guarantee of fineness based on fixed gold and silver content, and the establishment of a modern mint to strike coins domestically.

Around the time of the abolition of domains and establishment of prefectures (haihan-chiken, Meiji 4, 1871), the recall of domain notes also became urgent. Monetary reform that would reconcile the old gold, silver, and copper coins with the new paper currency and new coinage was positioned as one of the most critical tasks in state-building for the Meiji government, ranking alongside military reform and diplomacy.

The central figure in the Meiji government's monetary reform was Ōkuma Shigenobu (大隈重信), a native of the Hizen domain (Saga domain). Appointed Ōkura-taifu (大蔵大輔, Vice Minister of Finance) in 1869 (Meiji 2), Ōkuma was only 31 years old at the time. As a young finance official, he voraciously studied Western economic systems and set to work designing a new monetary framework.

Ōkuma's principal references were the American Coinage Act (1792) and the bimetallic gold-silver standard of French-speaking countries. His goals were a decimal system—1 yen = 100 sen = 1,000 rin—that would eliminate the need for complex currency-conversion arithmetic, and the establishment of a gold standard linked to international exchange rates. Joining the gold standard that had become widespread among foreign nations during the late Edo and early Meiji periods (formally established in Britain in 1816) was also a prerequisite for Japan to be recognized as a modern state.

On May 10, 1871 (Meiji 4), the New Currency Regulations (新貨条例) were promulgated. Gold was set as the monetary standard, with 1 yen pegged to 1.5 g of pure gold (equivalent to approximately 1.67 g of gold coin at a fineness of .900). Gold coins were issued in five denominations—20 yen, 10 yen, 5 yen, 2 yen, and 1 yen—while silver and copper coins were also issued as subsidiary currency. The 20-yen gold coin, the highest denomination, was positioned as the 'flagship product' demonstrating Japan's creditworthiness in international financial markets.

The implementation of the New Currency Regulations marked a watershed in Japan's economic modernization. Ōkuma continued to be involved in fiscal policy thereafter, devoting himself to building the foundations of the modern Japanese economy until he was forced out of the government in the Political Crisis of 1881 (Meiji 14).

The implementation of the New Currency Regulations required a mint equipped with modern facilities. The Meiji government purchased a complete set of manufacturing equipment from the Royal Hong Kong Mint and decided to establish a new mint in Osaka.

On April 4, 1871 (Meiji 4), the Osaka Mint (大阪造幣局, initially called the Zōhei-ryō) officially opened. The building, constructed near the former residence of Ogata Kōan in Osaka, was fitted with the latest Western manufacturing machinery powered by steam engines, including rolling mills, cutting presses, and coining presses. Gotō Shōjirō was appointed as the first Mint Director, and foreign engineers, headed by Thomas William Kinder (a British engineer), provided technical guidance.

The design of the former 20-yen gold coin features a dragon motif inscribed with「大日本」and the year on the obverse, and a chrysanthemum crest together with the denomination「二十圓」on the reverse. The dragon is an auspicious motif from Japanese tradition and at the same time a bold design element found on Western coinage as well, making it a design that fused the visual languages of East and West. The specifications—33.33 g in weight and .900 in fineness—were calibrated in accordance with international gold coins of the era, such as the British sovereign and the American 20-dollar gold coin.

The former 20-yen gold coin was the largest and highest-denomination piece in the Meiji gold coin series, and it carried the significance of a 'specimen coin' demonstrating the technical capabilities of the Osaka Mint to audiences at home and abroad. Total mintage is given as approximately 150,000 pieces, struck over a ten-year period from Meiji 3 through Meiji 13, though annual output varied considerably.

Among all former 20-yen gold coins, those bearing the date「明治三年」occupy a singular position. The Osaka Mint officially opened in April 1871 (Meiji 4), meaning that in 1870 (Meiji 3) work was still at the stage of constructing the building, installing equipment, and conducting test runs. Yet a certain number of former 20-yen gold coins inscribed「明治三年」have been confirmed to exist in today's collector market, with estimates placing surviving examples at no more than several dozen.

Various theories exist regarding how the Meiji 3 date came about. One leading theory holds that these were 'trial pieces' or 'verification samples' produced through trial-striking or proof-striking carried out before the mint commenced full operation—manufactured in small quantities to test the performance of the coining equipment or as sample pieces for presentation to the government. (Accounts of this background differ among sources and have not been definitively established.)

Another theory posits the possibility that part of the manufacturing process was carried out in advance at a separate facility during Meiji 3. Because the Meiji government was pressing urgently for the establishment of a monetary system, the possibility that some trial production was conducted before the official opening cannot be entirely ruled out. In any case, surviving former 20-yen gold coins bearing the Meiji 3 date are extraordinarily few in number, and no official documents that fully establish their provenance have been confirmed to date.

Records exist of examples having appeared at Heritage Auctions in the United States, and the issue is recognized among international Japanese numismatic collectors as a rarity of the highest rank.

Individual prices are listed only once verifiably matched, sourced records exist.