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| Issuer | Allied Military Authority (United States) |
|---|---|
| Year | 1951 |
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| In circulation to | 15 May 1958 |
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| Reverse description | Printed in olive-brown, the reverse is dominated by a large central floral and foliate vignette comprising stylised acanthus leaves and blossoms rising from an ornate basket, set against a fine guilloche background. Corner ornaments with scroll-work frame the central motif. The English inscription "ISSUED PURSUANT TO MILITARY PROCLAMATION" appears across the top, with the Japanese equivalent 軍事布告に基き發行す running along the lower margin. |
| Reverse lettering | ISSUED PURSUANT TO MILITARY PROCLAMATION す行發き基に告布事軍 (Translation: Issued pursuant to military proclamation) |
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| Comments |
The B-Yen notes were issued by the United States military for use in occupied Japan, denominated in yen but completely separate from the Japanese domestic currency supply — the deliberate segregation was meant to prevent American servicemen from arbitraging the artificially pegged exchange rate. The 1951 series replaced the earlier 1945–46 occupation currency as the Korean War dramatically increased the number of U.S. personnel cycling through Japan, making the volume of currency exchange a genuine macroeconomic problem for the host economy.
B-Yen were non-convertible outside military channels, though black market leakage was persistent and well-documented by occupation authorities throughout the early 1950s.