Representative Edo issue

Keicho Oban: Large-Format Official Gold

Keicho Oban represent large official gold pieces whose production, ink signatures, and roles differ from ordinary one-ryo Koban.

慶長大判Keichō Ōban

Context

Historical and monetary setting

Oban served ceremonial, gift, and high-value functions and were associated with hereditary Goto gold work.

Identification

Compare dimensions, weight, hammered fabric, crest punches, ink inscription, and kao with specialist references.

Evidence boundary

The representative image shows one face of one museum object; it is not a template for every Keicho Oban.

Evidence

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

Oban and the Goto Family Bank of Japan Currency Museum

Oban fineness changes and Goto-family production context.

Open source

Money and Society in the Edo Period: Three-Currency System Bank of Japan Currency Museum

Gold, silver, and copper valuation conventions; Oban, Chogin, and Mameitagin roles.

Open source