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20 Sen Uniface pattern
| Issuer | Japan |
|---|---|
| Year | |
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| Composition | Log in to see details |
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| Diameter | Log in to see details |
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| Technique | Milled |
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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 | Uniface pattern; the reverse is entirely blank and unadorned, presenting a plain polished field consistent with a trial or pattern striking intended to test the obverse die only. No legends, devices, or mint marks are present. |
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| Mintage | ND |
| Additional information |
Japanese pattern coins of the Meiji period were frequently produced as internal proposals submitted to the mint's own design committee or to foreign advisory engravers, and many never progressed beyond a single presentation striking. Uniface patterns — struck on only one die with the reverse left blank — were a standard proofing technique used at the Osaka Mint during the 1870s and 1880s to evaluate obverse or reverse designs in isolation before committing to a full working die pair.
The 4.50g weight aligns with the silver 20 sen standard established under the New Currency Act of 1871, which pegged Japanese coinage to a decimal system modeled partly on the U.S. dollar structure.