Ōban

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Maneki Neko, with Ōban attached to collar

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.^[1]

The first Oban – Tenshō Ōban (天正大判) – were minted by the Gotō family under the orders of Hideyoshi in 1588.^[2]

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

Notes

^ Metzler p.15
^ The Cambridge History of Japan: Early modern Japan by John Whitney Hall p.61 [1]

References

Mark Metzler (2006). Lever of empire: the international gold standard and the crisis of liberalism in prewar Japan. Vol. 17 of Twentieth Century Japan: The Emergence of a World Power. University of California Press. ISBN 0-520-24420-6.

Japanese currency (pre-yen)

Topics

Currency Museum (Japan)
List of Japanese cash coins by inscription
List of Japanese coinage patterns
Mother coin
Nagasaki trade coins
Numismatic charm
Momme (unit)
Yen currency

Coinage

Pre-Edo	Mumonginsen 667–672 Huhonsen 683 Kocho Junisen 708–958 Kaiki Shoho 760 Taihei Genpō 760
Edo	Koban 1601–1868 Kan'ei Tsūhō 1626–1868 Ichibuban 1714–1854 Shu (silver) 1772–1869 Shu (gold) 1824–1869 Tenpō Tsūhō 1835-1870 Ichibugin 1837–1869
Multi	Chinese coinage c. 1101–1700 Mon 1336–1870 Bitasen 1404–1670 Ryukyuan mon 1454–1879 Ryō 1500s–1871 Ōban 1573–1862