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Ōban

Former currency of the Tokugawa system

An Ōban (大判) was a monetary ovoid gold plate, and the largest denomination of Tokugawa coinage. Tokugawa coinage worked according to a triple monetary standard, using gold, silver and bronze coins, each with their own denominations.

The first Oban – Tenshō Ōban (天正大判) – were minted by the Gotō family under the orders of Hideyoshi in 1588.

The Tenshō Ōban was equivalent to ten Ryōs, or ten Koban (小判) plates, with a weight of 165 g.

Notes

References

Metzler p.15
''The Cambridge History of Japan: Early modern Japan'' by John Whitney Hall p.61 [https://books.google.com/books?id=k_BrQL4Pn0QC&pg=PA61]

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