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| 正面描述 | Flat oval gold flan with a finely ridged (horizontal line) background covering the entire field. At the upper center, a fan-shaped (ginkgo-leaf) stamp bears the character '壹' (one) in grass script. Below it, a large rectangular cartouche stamped in the center of the field contains the two characters '壹両' (one ryō) in flowing grass script, the hallmark of the Goto assay house. Below the central cartouche, an elongated oval stamp bears the character '光' (Mitsu, part of the assayer's name Goto Mitsutsugu). At the lower center, a second fan-shaped stamp bears the character '次' (tsugi, completing the name Mitsutsugu), all stamps applied by hand in the traditional koban style. |
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| 正面文字 | 登录 以查看详情 |
| 正面铭文 | 登录 以查看详情 |
| 背面描述 | 登录 以查看详情 |
| 背面文字 | 登录 以查看详情 |
| 背面铭文 | 登录 以查看详情 |
| 边缘 | 登录 以查看详情 |
| 铸币厂 | Edo (Tokyo) Mint, under the authority of the Goto Assay House |
| 铸造量 | 登录 以查看详情 |
| 附加信息 |
The Keichō Koban was the first standardized gold coinage issued under Tokugawa Ieyasu following his consolidation of power after Sekigahara, deliberately engineered to displace the inconsistent regional gold currencies that had circulated under rival daimyō. Ieyasu placed the Kinza — the gold mint authority — under direct shogunal control, with the Gotō family holding hereditary assaying and certification responsibilities for the entire production run spanning nearly a century.
Weight and fineness degraded measurably across successive issues within this type, a quiet fiscal policy the shogunate never publicly acknowledged.