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First you need a little background on old Japanese currency. Back in the Edo period, a 文{もん} was the lowest denominator of currency. A 貫{かん} is a weight measurement (3.75 kg), but is also the weight of 1000 文, which were stringed together to make 10 rolls of 100 coins and those rolls themselves would be used in payment. 九百 comes from 九百文, which is 100 文 ...


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