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10 Yen - Shōwa Brass Prototype
| Issuer | Japan Mint |
|---|---|
| Year | |
| Type | Log in to see details |
| Value | Log in to see details |
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| 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 | Round |
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| In circulation to | Log in to see details |
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| Obverse description | Log in to see details |
|---|---|
| Obverse script | Log in to see details |
| Obverse lettering | Log in to see details |
| Reverse description | The reverse presents a plain, unadorned field enclosed by a beaded inner border running the full circumference. At center, the two-character Japanese inscription 試作 (shisaku, meaning 'prototype' or 'trial piece') is incused in bold strokes, confirming the experimental nature of the piece. The simplicity of the reverse is characteristic of pattern and trial coin production at the Japan Mint, where the reverse was often left largely blank to focus evaluation on the obverse design. |
| Reverse script | Log in to see details |
| Reverse lettering | 試 作 (Translation: Prototype) |
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| Additional information |
Japan's postwar coinage redesign involved extensive prototype testing before the 10 Yen series was finalized in brass-clad bronze for circulation in 1951. This particular prototype, catalogued under KM Pn102, reflects an intermediate stage in that material evaluation — brass was under serious consideration before the final alloy composition was settled. Prototypes from this program rarely escaped the Mint's own archives.