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4 Mon 'Bunkyūeihō' Bosen, tin alloy, cursive script, KŌKAKU KATSUEN
| Issuer | Japan |
|---|---|
| Year | 1863-1868 |
| Type | Log in to see details |
| Value | Log in to see details |
| 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 |
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| 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 |
| Reference(s) | KM# Pn10 |
| Obverse description | Log in to see details |
|---|---|
| Obverse script | Log in to see details |
| Obverse lettering | 攵 寶 永 久 (Translation: Eternal money of the Bunkyū Era) |
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| Reverse script | Log in to see details |
| Reverse lettering | Log in to see details |
| Edge | Plain |
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| Additional information |
The Bunkyu Eiho 4 mon pieces in tin were trial issues — pattern coins, not circulating currency — produced as the Tokugawa shogunate experimented with alternative compositions during a period of acute copper shortages. The Kōkaku Katsuen attribution identifies the specific casting authority, a detail that matters for provenance within a series where multiple foundries produced nearly indistinguishable types. Tin was ultimately rejected for general circulation, making the surviving examples products of administrative deliberation rather than monetary deployment.