Representative transition issue

Ansei Koban

A short-lived late Tokugawa Koban immediately preceding the Man’en emergency standard.

安政小判

Exact documented obverse of an 1859 Ansei Koban photographed at the Toi Museum. — World Imaging · CC BY-SA 3.0 · via Wikimedia Commons · exact 1859 display crop with deterministic background removal. · Exact 1859 Ansei Koban obverse; the reverse remains unavailable and is not reconstructed.

Date: 1859
Denomination: 1 ryō
Form: oval
Local status: Published

Context

Historical and monetary setting

Its place in the reform sequence helps distinguish late Tokugawa continuation from the much smaller Man’en response.

Identification

How to classify the evidence

Confirm oval form, punches, dimensions, mass, surface, and provenance; do not identify by gold color alone.

Evidence boundary

What this page does not claim

The installed image is the exact 1859 obverse from a labeled museum comparison; the undocumented reverse remains a truthful placeholder and is not reconstructed.

Issue evidence

Specifications and date record

Display date: 1859
Mass: 8.97 g
Catalog fineness: 57%
Edge: —
Image status: cleared exact obverse; reverse unavailable
Identity confidence: high

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Related transition references

Ansei and Man’en Recoinages Bakumatsu and Early Meiji Coinage Foreign Silver in Japan New Currency Act of 1871 Early Meiji Gold Coinage Early Meiji Silver Coinage Early Meiji Copper and Bronze Coinage Japanese era-date guide

Evidence

Sources and scope

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

Late Tokugawa coin display records Bank of Japan Currency Museum

Museum catalog fineness values for Ansei and Man’en gold and silver issues.

Open source