An Ōban 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 were minted by the Gotō family under the orders of Hideyoshi in 1588.[2]
The Ōban (大判) was equivalent to ten Ryōs, or ten Koban (小判) plates, with a weight of 165 g.
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