What is the Bunsei Ichibu-han: A Small Gold Coin in the Edo Monetary System
The Bunsei Ichibu-han (文政一分判), also known as Bunsei Ichibukin, is a small gold coin (ichibukin) minted by the Edo shogunate starting from Bunsei 2 (1819). 'Ichibu' represents a quarter of a ryou in denomination, and 'han' is an ancient term used for units of gold coins, making ichibukin and ichibu-han synonymous. While large gold coins (kobans and obans) in the Edo period were in 'ichiryou' units, ichibu-hans were practical gold coins that circulated widely for smaller transactions. The Bunsei Ichibu-han circulated alongside the Bunsei Koban (edo-gold-012), which was minted during the same Bunsei period. It was used in commercial transactions and as gifts. The 'Bunsei' in Bunsei Ichibu-han refers to the Bunsei era (1818–1830) under the rule of the 11th shogun Tokugawa Ienari. Its most notable feature is the 'sōbun' inscription, a sōsho script of the character '文'. For more details on the overall system of Edo gold coins, see Introduction to Edo Gold Coins (Kobans and Obans).
Basic Specifications and Visual Features of the Bunsei Ichibu-han
The basic specifications of the Bunsei Ichibu-han are as follows: it weighs approximately 3.28g, has dimensions of about 20mm in height by 10mm in width in a rectangular shape (similar to a miniature oval shape of the Bunsei Koban), and has a gold fineness of approximately 56.8% (56.8% gold, 39.9% silver, and the rest being copper and other metals). There are three notable visual features. First is the 'sōbun' inscription on the obverse, an altered script style of the character '文', distinguishing it from the previous Genbun Ichibu-han (楷書 '文'). Second is the 'Kiri' crest (Gosan no Kiri) on the obverse, representing the authority of the Tokugawa shogunate. Third is the Gotoh family (Mitsutsugu) kaō and the date mark on the reverse. These marks are crucial when differentiating various ichibu-han from different periods. For a systematic learning of the types and identification methods of Edo gold coins, including kobans and ichibu-hans, see Guide to Types and Identification of Edo Kobans.
The Ichibukin Series of the Edo Period: From Keichō to Man'en
The Bunsei Ichibu-han is part of an ichibukin (ichibu-han) series minted throughout the Edo period. The series begins with the Keichō Ichibukin from Keichō 6 (1601), followed by the Genroku Ichibukin from Genroku 9 (1696), the Shōtoku Ichibukin from Shōtoku 4 (1714), the Kyōhō Ichibukin from Kyōhō 7 (1722), the Genbun Ichibukin from Genbun 1 (1736), the Bunsei Ichibu-han from Bunsei 2 (1819), the Tenpō Ichibukin from Tenpō 8 (1837), the Ansei Ichibukin from Ansei 6 (1859), and finally the Man'en Ichibukin from Man'en 1 (1860). Each period's ichibukin had variations in gold fineness, weight, and script style, reflecting the shogunate's financial status and re-minting policies. Notably, the re-minting from the Genbun Ichibu-han to the Bunsei Ichibu-han (Bunsei 2) saw a slight reduction in gold fineness from the Genbun level. Understanding this ichibukin lineage alongside the re-minting of Bunsei Kobans offers insights into the fiscal condition of the late Edo shogunate. For a comparison with the Bunsei Koban, see The Value and Market of Bunsei Kobans.
Gold Fineness of Bunsei Ichibu-han and Its Relation to Bunsei Kobans
The gold fineness of the Bunsei Ichibu-han is approximately 56.8%, which is nearly the same level as the Bunsei Koban minted in the same period (gold fineness 56.4%). This was not coincidental but resulted from a unified fineness setting under the same re-minting policy. Under the era of the 11th shogun Ienari during the Bunsei era (1818–1830), the shogunate finances were chronically in deficit, making revenue from re-minting one of the main financial sources. A gold fineness in the 56% range was significantly reduced from the over 80% level of the Keichō and Kyōhō Kobans, showing the accumulated result of re-minting over the years. Thus, the intrinsic bullion value of the Bunsei Ichibu-han corresponds to about 1.86g of the pure gold content from its total weight of 3.28g, serving as a calculation basis for its pure gold value. The market price is formed by adding a collection premium to the bullion value (market prices are listed only for verified records). For factors that determine the value of old coins, see Factors That Determine the Value of Old Coins.
Market Value and Price Range: Attractive for Beginners
The market price of the Bunsei Ichibu-han fluctuates depending on its condition, but it is generally more accessible within the Edo gold coin category. Average condition with discernible letters and stamps ranges from 25,000 to 50,000 yen, clear letters in good condition range from 60,000 to 120,000 yen, while exceptionally fine coins with complete stamps and remaining bullion luster are valued at 150,000 to 350,000 yen generally. Compared to Bunsei Kobans (around 70,000 to 150,000 yen for average condition), it is priced lower, making it suitable as an entry point for collecting Edo gold coins. Good condition Bunsei Ichibu-hans have been garnering attention among collectors in recent years as reasonably priced, authentic historical coins with potential value increase. Latest auction results can be checked at Search Past Auction Records. It is important to continuously monitor market trends.
Authentication: Characteristics of Forgeries and Imitations of Bunsei Ichibu-han
Due to its high value, there are a certain number of forgeries and improperly re-stamped Bunsei Ichibu-han (where others have been fraudulently stamped with Bunsei marks). There are three main points for verifying authenticity. First is weight measurement. A deviation of more than 0.2g from the standard weight of 3.28g is a red flag. Forgeries may have off-spec bullion fineness or weight. Second is the examination of the precision of the 'sōbun' stamp. Authentic stamps showcase uniform line quality and consistent depth. Counterfeit stamps tend to have shallow, inconsistent lines. Third is the precision of the kaō. The Gotoh family kaō possesses unique curves, where attention to detail in their shape is key for authentication. Weigh using a precision balance and consult a trustworthy expert before purchasing. For a comprehensive guide on distinguishing counterfeits, see Complete Guide to Detecting Fakes and Altered Coins.
Comparison with Tenpō Ichibukin and Ansei Ichibukin: Decline in Fineness Toward the End of the Edo Period
The successors to the Bunsei Ichibu-han (from Bunsei 2, 1819 to around Tenpō 8, 1837) are the Tenpō Ichibukin (from Tenpō 8, 1837 to Ansei 6, 1859), followed by the Ansei Ichibukin (from Ansei 6, 1859 to Man'en 1, 1860). Examining the changes in gold fineness, we see a transition from Bunsei (56.8%) to Tenpō (56.8%, same as Bunsei) to Ansei (57.0%, slight improvement) to Man'en Ichibukin (58.3%, slight increase due to re-minting during Man'en). Interestingly, towards the end of the Edo period, the ichibukin maintained nearly the Bunsei level of fineness, while kobans experienced a more significant decline. It appears that ichibukin were widely used in retail transactions, preventing any extreme reduction in fineness that might disrupt the market. Further details on the Tenpō gold coins can be studied in The Value and Market of Tenpō Kobans.
Collection and Storage: A Practical Guide to Beginners of Edo Gold Coins
The Bunsei Ichibu-han is an excellent starting point for a collection of Edo gold coins. By pairing the Bunsei Koban (one ryou) with the Bunsei Ichibu-han (one ichibu = 1/4 ryou), collectors can create a 'textbook collection' that visually represents the tiered structure of Edo currency systems. Begin with a single coin in good condition (around 60,000 to 100,000 yen) to develop an eye for script styles, stamp markings, and kaōs, progressively elevating the collection's grade. Store the coins in a dry, sealed container, using individual coin cases to prevent direct contact with other coins. Though gold is relatively resistant to corrosion, surface dirt from fingerprints or pollutants in the air can tarnish value. For the basics of proper storage, see Proper Storage Methods for Old Coins. For reliable purchasing sources, refer to Guide to Obtaining and Purchasing Old Coins. The Bunsei Ichibu-han provides a profound collecting subject allowing enjoyment of Edo-era craftsmanship and currency history, from beginners to advanced collectors.