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| 表面の説明 | Round cast coin with a central square perforation. Four Chinese characters are arranged in cruciform fashion around the square hole, reading clockwise from the top: 寛 (top), 通 (right), 永 (bottom), 寶 (left), forming the legend Kan'eitsūhō, meaning 'Currency of Kan'ei.' The characters are rendered in a bold, recessed style typical of Edo-period cast coinage, set within a plain, slightly raised inner and outer rim. |
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| 表面の文字体系 | ログイン して詳細を見る |
| 表面の銘文 | ログイン して詳細を見る |
| 裏面の説明 | ログイン して詳細を見る |
| 裏面の文字体系 | ログイン して詳細を見る |
| 裏面の銘文 | ログイン して詳細を見る |
| 縁 | ログイン して詳細を見る |
| 鋳造所 | ログイン して詳細を見る |
| 鋳造数 | ND (1769-1788) - 俯永; 永 with large head slightly point down; top dot of 寶 thru its crown - ND (1769-1788) - 小字; 永 with small head point straight left and long left leg; low 通 with head マ far from rim - ND (1769-1788) - 正字; 永 with head point straight left and short left leg; high 通 with head マ near rim - ND (1769-1788) - 永 with small head point down and small left arm point down; - |
| 追加情報 |
The Kan'eitsūhō series had been minted in various forms since 1636, but the four-mon copper issues introduced under the Meiwa era represented a deliberate government response to chronic small-denomination shortages that had plagued the Tokugawa economy for decades. The eleven-wave reverse — distinguishing this type from the seven-wave variant — was a design decision tied to mint attribution and period of issue, not aesthetics.
By the 1770s, widespread counterfeiting of these coins had become a serious administrative problem for the Edo shogunate.