Evidence-gated objects

Patterns, Trials, and Unissued Pieces

Separate official patterns, trials, production preparations, and unissued pieces from circulating coinage, including Yatagarasu silver, ceramic sen, and the 1950 nickel-silver 10 yen.

試作貨幣・未発行貨幣

Obverse of the Showa 20 (1945) 1 Sen of Japan — Ihimutefu, CC BY-SA 4.0, via Wikimedia Commons; exact museum photograph with deterministic circular isolation. · Representative contextual pair

Reverse of the Showa 20 (1945) 1 Sen of Japan — Ihimutefu, CC BY-SA 4.0, via Wikimedia Commons; exact museum photograph with deterministic circular isolation. · Representative contextual pair

Core routes: 20
Issue studies: 14
Exact image pairs: 15
Indexable routes: 0

Context

Historical and monetary setting

Survival, a date, or a dealer label does not prove issue. Japan Mint museum records provide the controlling status for the objects included here.

Identification

How to classify the object

Record issuing authority, proposed year, material, design, documentation, and production status separately.

Evidence boundary

What this page does not claim

Every route and object on this page remains noindex; fantasy and modern reproduction labels are not catalog proof.

Image	Object	Japanese	Year	Material	Production status	Evidence
Representative contextual image: Small identification thumbnail of the Yatagarasu 10 Sen.↗	Yatagarasu 10 Sen	八咫烏十銭銀貨	1918–1919	silver alloy	unissued	Japan Mint hole-history bulletin
Representative contextual image: Small identification thumbnail of the 1918 Yatagarasu 50 Sen.↗	Yatagarasu 50 Sen	八咫烏五十銭銀貨	1918	silver alloy	unissued	Japan Mint Museum guide
Representative contextual image: Obverse and reverse of the Showa 20 (1945) 1 Sen of Japan.↗	Ceramic 1 Sen Preparation	陶製一銭貨	1945	ceramic	production preparation	Japan Mint FAQ and museum guide
Representative contextual image: Small exact identification thumbnail of the holed 1950 nickel-silver 10 Yen pattern.↗	1950 Nickel-Silver 10 Yen	昭和二十五年洋銀十円貨	1950	nickel silver	unissued	Japan Mint Museum guide

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Related Taisho–Showa references

Shōwa Coinage: Prewar, Wartime, and Transition Taishō and Shōwa Coinage Taishō Coinage Early Shōwa Prewar Coinage Wartime Japanese Coinage Emergency Coin Materials Postwar Coinage Transition

Evidence

Sources and scope

These links support the claims on this page. Source authority does not imply permission to republish source images.

Mint Museum guide: unissued coins Japan Mint Museum

Unissued 1918 Yatagarasu 50 sen, 1945 ceramic denominations, and unissued 1950 nickel-silver 10 yen.

Open source

Coin FAQ Japan Mint

Obverse/reverse convention, unissued ceramic status, postwar brass scrap composition, edge changes, and later silver-to-cupronickel transition.

Open source

History of holed coinage Japan Mint

Taishō holed 5- and 10-sen designs, material saving, anti-counterfeiting, and the unissued Yatagarasu 10 sen.

Open source