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4 Mon 'Bunkyūeihō' Bosen, copper alloy, cursive script, KŌKAKU KETSURIN
| Issuer | Japan |
|---|---|
| Year | 1863-1868 |
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| Value | Log in to see details |
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| Composition | Copper (Copper alloy) |
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| Obverse description | Log in to see details |
|---|---|
| Obverse script | Log in to see details |
| Obverse lettering | Log in to see details |
| Reverse description | The reverse displays a decorative wave or overlapping scale pattern (seigaiha) radiating symmetrically from the central square hole toward the outer rim, rendered in bold cast relief. The design is divided into multiple arched segments arranged in concentric fan-like rows, filling the entire field between the square perforation and the outer rim. No inscriptions or legends appear on this face. This ornamental reverse treatment is characteristic of bosen (母銭) master coins produced for use as casting models, and the crisp definition of the pattern reflects the high quality expected of such working dies. |
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| Edge | Plain |
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| Additional information |
The Kōkaku ketsurin — literally "Imperial sanction withheld" — designation marks coins that the Emperor Kōkaku refused to authorize during his reign, a bureaucratic standoff between the imperial court and the Tokugawa shogunate over monetary policy that left certain issues in limbo for decades. The 4 mon Bunkyūeihō series was authorized under the Bunkyū era (1861–1864), but the ketsurin classification meant production and legitimacy remained contested well into the Meiji transition.
The cursive script variety is the rarer of the two script styles struck for this type.