4 Mon "Kan'eitsūhō Iron Alloy; reverse イ I

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表面の文字体系	Chinese
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裏面の説明	Plain cast field surrounding the central square hole, decorated with eleven wave motifs radiating outward from the rim of the perforation toward the outer edge of the coin. The Katakana character イ (i) appears in raised relief above the square hole, serving as a mint or batch control mark. The wave pattern, characteristic of the 4 Mon Kan'ei series, varies in starting position relative to the hole according to the specific variety (Kōha or Kyōha).
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追加情報	By 1866, the Tokugawa Shogunate was hemorrhaging silver and copper reserves to meet treaty obligations forced open by Western powers after 1854, prompting emergency iron coinage as a stopgap measure. The "Kan'eitsūhō" denomination had been in continuous nominal use since 1636, but these late iron issues bear almost no relationship — metallurgically or economically — to their copper predecessors. The reverse kana イ served as a mint or batch identifier, a practice adopted to manage accountability across the fragmented emergency production. The Shogunate collapsed within two years of this issue.

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