Bunsei Ichibuban: A Small Gold Coin in the Edo Gold Coin System
The Bunsei Ichibuban (文政一分判) is a small gold coin (ichibukin) that the Edo shogunate began minting in Bunsei 2 (1819). "Ichibu" (一分) indicates a denomination valued at one-fourth of one ryō, and "ban" (判) is an old term used as a unit for gold coins, making ichibukin and ichibuban synonymous. While large gold coins from the Edo period (koban and ōban) were denominated in units of one ryō, ichibuban circulated in large numbers as practical coins for smaller transactions. The Bunsei Ichibuban circulated alongside the Bunsei Koban (edo-gold-012) minted in the same era, used in commerce and as gifts. "Bunsei" in Bunsei Ichibuban refers to the Bunsei era (1818–1830) under the rule of the 11th Shogun Tokugawa Ienari, and its most notable feature is the "Bun" character stamped in sōsho script, also known as "sōbun" (草文). For more details on the overall system of Edo gold coins, see Intro to Edo Gold Coins (Koban & Ōban).
Basic Specifications and Visual Features of the Bunsei Ichibuban
The basic specifications of the Bunsei Ichibuban are as follows: a weight of approximately 3.28g, a rectangular shape measuring approximately 20mm x 10mm (close to an oval version of the Bunsei Koban), and a gold fineness of about 56.8% (56.8% gold, 39.9% silver, remaining in copper and other metals). There are three main visual features. First is the sōbun (草文) stamp on the obverse. The character "Bun" in sōsho style sets it apart from the straight-style character on the Genbun Ichibuban, making it a key identifier of the Bunsei Ichibuban. Second is the kiri (paulownia) crest (五三桐) on the obverse, symbolizing Tokugawa shogunate's authority. Third is the Gotō family (Mitsunari) kaō and date stamp on the reverse. These combinations of marks serve as important clues for distinguishing ichibuban from different eras. For a systematic guide to the types and identification methods of Edo gold coins, including koban and ichibuban, see Guide to Types and Identification of Edo Koban.
Ichibukin Series in the Edo Period: From Keichō to Man'en
The Bunsei Ichibuban is part of the ichibukin (ichibuban) series minted throughout the Edo period. This series began with the Keichō Ichibukin in Keichō 6 (1601), followed by the Genroku Ichibukin in Genroku 9 (1696), the Shōtoku Ichibukin in Shōtoku 4 (1714), the Kyōhō Ichibukin in Kyōhō 7 (1722), the Genbun Ichibukin in Genbun 1 (1736), the Bunsei Ichibukin in Bunsei 2 (1819), the Tenpō Ichibukin in Tenpō 8 (1837), the Ansei Ichibukin in Ansei 6 (1859), and lastly the Man'en Ichibukin in Man'en 1 (1860). Each era's ichibukin differed in gold fineness, weight, and script, reflecting the changing financial and recasting policies of the shogunate. The transition from Genbun Ichibukin to Bunsei Ichibukin (Bunsei 2) saw a slight reduction in gold fineness from the Genbun standard. Understanding this ichibukin lineage alongside the recasting of Bunsei Koban provides insight into the fiscal state of the late Edo shogunate. For comparison with Bunsei Koban, see Value and Market of Bunsei Koban.
Gold Fineness of the Bunsei Ichibuban and its Relation to Bunsei Koban
The gold fineness of the Bunsei Ichibuban is approximately 56.8%, almost the same as the Bunsei Koban (gold fineness 56.4%) minted in the same period. This uniformity is no coincidence but a result of a standardized fineness setting within the same recoinage policy. Under the reign of the 11th Shogun Ienari during the Bunsei era (1818–1830), the shogunate's finances were chronically in deficit, making profit from recoinage a primary source of revenue. The gold fineness in the 56% range is significantly lower than the over 80% of the Keichō and Kyōhō Koban, showcasing the cumulative effect of many years of recoinage. Due to this, the bullion value (pure gold part) of the Bunsei Ichibuban is approximately 1.86g out of a weight of 3.28g. The bullion value, calculated on the basis of pure gold content, is roughly 15,000 to 20,000 yen currently, but market prices exceed this with collectible premiums added. Factors determining the value of old coins can be found in Factors Determining the Value of Old Coins.
Market Value and Price Range: An Attractive Entry Price Range
The market price of the Bunsei Ichibuban varies depending on its condition, although it is relatively accessible among Edo gold coins. Average condition coins where inscriptions and stamps are discernible range from 25,000 to 50,000 yen, finer condition coins with clear inscriptions range from 60,000 to 120,000 yen, and extremely fine coins with intact stamps and a lustrous surface range from 150,000 to 350,000 yen. Compared to Bunsei Koban (average condition 70,000 to 150,000 yen), the Bunsei Ichibuban is lower in price, making it suitable as an "entry point" for collecting Edo gold coins. The good-condition class of the Bunsei Ichibuban, considered a "reasonably priced authentic old coin" with potential for value increase in the future, has been gaining attention among collectors in recent years. Latest auction results can be checked at Search Past Auction Results. Continuously monitoring market trends is important.
Authentication: Characteristics of Forgeries and Similar Versions of Bunsei Ichibuban
Due to its high value, a certain number of forgeries and illicitly altered coins (which have the Bunsei stamp added to other ichibukin) exist for the Bunsei Ichibuban. The main points for authenticating the coin are threefold. First is weight measurement. A discrepancy of over 0.2g from the standard weight of 3.28g requires caution. Forgeries often deviate from the stipulated bullion fineness or weight. Second is confirming the precision of the sōbun stamp. Authentic stamps feature even line quality and consistent depth. Counterfeit after-stamp impressions often lack depth and uniformity. Third is the precision of the kaō. The Gotō family kaō has a unique curve design, with details in shape being crucial for authentication. Before purchase, always verify weight with a precise scale and consult a reliable expert. General methods for distinguishing fakes can be systematically learned at Complete Guide to Identifying Fakes & Altered Coins.
Comparison with Tenpō Ichibukin and Ansei Ichibukin: Decline in Fineness Towards the End of the Edo Period
The successor to the Bunsei Ichibuban (Bunsei 2 year/1819 to Tenpō 8 year/1837) is the Tenpō Ichibukin (Tenpō 8 year/1837 to Ansei 6 year/1859), followed by the Ansei Ichibukin (Ansei 6 year/1859 to Man'en 1 year/1860). Observing the transition of gold fineness, it follows Bunsei (56.8%) → Tenpō (56.8%, same as Bunsei) → Ansei (57.0%, slight improvement) → Man'en Ichibukin (58.3%, slight increase due to Man'en recoinage). Noteworthy is that approaching the end of the Edo period, the ichibukin managed to maintain roughly the Bunsei level of fineness, avoiding the drastic decline occurring with koban. This is thought to be due to the widespread use of ichibukin in retail, where significant reductions in fineness could have disrupted the market. For more in-depth exploration of Tenpō gold coins, see Value and Market of the Tenpō Koban.
Collection and Storage: A Practical Guide as an Introduction to Edo Gold Coins
The Bunsei Ichibuban is highly suited as an introduction to Edo gold coin collecting. By displaying Bunsei Koban (one ryō) alongside Bunsei Ichibuban (one bu = 1/4 ryō), a "textbook collection" can be created for visually understanding the hierarchical structure of the Edo currency system. Starting with a fine condition piece (around 60,000 to 100,000 yen), it's recommended to gradually upgrade while honing skills on evaluating script, stamps, and kaō. For storage, use a sealed, dry container and individual coin cases to avoid direct contact between gold coins. Although gold is relatively corrosion-resistant, surface discoloration from finger oils or airborne pollutants can degrade value. Regarding storage basics, refer to Proper Coin Storage Methods. Detailed guidance on reliable acquisition sources can be found in Guide to Acquisition and Purchase Methods of Old Coins. The Bunsei Ichibuban is a profound collecting subject, offering enjoyment of Edo artisanship and monetary history from beginner to expert level.