Tokugawa monetary system

Edo Gold Coinage

Browse Koban, Oban, and rectangular gold as related but distinct object families within declared-value Tokugawa gold.

江戸金貨Edo kinka

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Context

Historical and monetary setting

Gold standards changed repeatedly from Keicho through Manen, altering mass and fineness while accounting names continued.

Identification

Use family form first, then named recoinage, official marks, calligraphy, dimensions, mass, and fineness evidence.

Evidence boundary

Oban are not oversized Koban, and one catalog standard cannot describe every era.

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Evidence

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

Early Edo Gold Recoinages Bank of Japan Currency Museum

Keicho through Kyoho Koban display-table masses and fineness values.

Open source

Later Edo Gold Recoinages Bank of Japan Currency Museum

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

Open source

Oban and the Goto Family Bank of Japan Currency Museum

Oban fineness changes and Goto-family production context.

Open source