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1 Bu 'Ansei Ichibu Kin'
| Issuer | Kinza (Gold Mint), Tokugawa Shogunate |
|---|---|
| Year | 1837-1858 |
| Type | Standard circulation coin |
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| Obverse description | The obverse displays two large stylized kiri (paulownia) crests in high relief, one positioned in the upper half and one in the lower half of the rectangular flan, separated by a horizontal dividing line. Each crest is rendered with elaborate foliate and floral detail, characteristic of the hammered Edo-period gold coinage tradition. The entire design is framed by a continuous border of raised pellets running along all four edges of the flan. The denomination characters 一分 (Ichibu, meaning '1 Bu') are incorporated into the central field between the two crests. |
|---|---|
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| Reverse script | Chinese (Kanji) |
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| Additional information |
The Ansei Ichibu Kin was not a new denomination but a debasement response. By the 1830s, the Tokugawa fiscal system was under sustained pressure — crop failures, peasant uprisings, and the costs of coastal defense drained the treasury. The Kinza reduced gold content from the earlier Bunsei issue's already-compromised alloy, continuing a long slide that had begun in the eighteenth century. Each successive ichibu issue contained less gold than the last, a pattern the merchant class tracked closely and exploited through currency arbitrage.
The series ended abruptly when American and European trade treaties forced Japan to confront its artificially distorted gold-to-silver ratios against world markets — triggering a monetary crisis that accelerated the Shogunate's collapse.