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Representative Edo issue

Genbun Koban: The 1736 Gold Recoinage

The Genbun standard paired a lower catalog mass and fineness than the preceding Kyoho display-table standard.

元文小判Genbun Koban

Genbun Koban obverse Genbun Koban reverse
As6673 · CC BY-SA 3.0 · via Wikimedia Commons · approved precise-object cleanup and deterministic derivative preparation. · Exact documented Genbun Koban; the approved cleanup preserves the photographed specimen's lettering, punches, wear, and oval outline.
Years
From 1736
Metal branch
gold
Value or unit
1 ryo
Catalog fineness
66%

Context

Historical and monetary setting

The 1736 recoinage belongs to the long adjustment of Tokugawa metallic standards and coin supply.

Identification

How to classify the object

Era-family attribution requires the correct official marks and fabric, not a date applied in modern terms.

Evidence boundary

What this page does not claim

The displayed 13 g and 66% are catalog comparison values, not universal surviving-specimen measurements.

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Related Edo references

Keicho Koban: Foundational Tokugawa One-Ryo GoldManen Koban: The Small Final Tokugawa Koban Standard

Evidence

Sources and scope

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

Later Edo Gold Recoinages Bank of Japan Currency Museum

Genbun through Manen Koban and Tempo Goryoban display-table masses and fineness values.

Open source