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4 Mon "Kan'eitsūhō" Iron Alloy; Reverse ノ NO
| Issuer | Japan |
|---|---|
| Year | 1866 |
| Type | Log in to see details |
| Value | 4 Mon |
| Currency | Log in to see details |
| Composition | Log in to see details |
| Weight | Log in to see details |
| Diameter | Log in to see details |
| Thickness | Log in to see details |
| Shape | Log in to see details |
| Technique | Log in to see details |
| Orientation | Log in to see details |
| Engraver(s) | Log in to see details |
| In circulation to | Log in to see details |
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| Obverse description | Log in to see details |
|---|---|
| Obverse script | Chinese (traditional, regular script) |
| Obverse lettering | Log in to see details |
| Reverse description | Log in to see details |
| Reverse script | Katakana |
| Reverse lettering | Log in to see details |
| Edge | Log in to see details |
| Mint | Log in to see details |
| Mintage | Log in to see details |
| Additional information |
Struck in the final years of the Tokugawa shogunate, the iron 4 Mon issues of the 1860s were a direct response to the chronic copper shortages that had undermined the existing Kan'ei Tsūhō series. Iron was never the preferred medium — it corrodes aggressively in Japan's humid climate, and the shogunate knew it — but the alternative was suspending production of small-denomination coinage entirely during a period of acute fiscal pressure and foreign treaty obligations draining the monetary system.
The reverse ノ mark identifies the Edo Fukagawa casting site. Most iron examples that survived did so in hoards rather than through circulation.