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Wu Zhu is a type of Chinese cash coin produced from the Han dynasty in 118 BC when they replaced the earlier San Zhu cash coins, which had replaced the Ban Liang (半兩) cash coins a year prior, until they themselves were replaced by the Kaiyuan Tongbao (開元通寳) cash coins of the Tang dynasty in 621 AD. The name Wu Zhu literally means "five zhu", with a zhu being a measuring unit officially weighing about 4 grams; however, in reality the weights and sizes of Wu Zhu cash coins varied over the years. During the Han dynasty, a very large quantity of Wu Zhu coins were cast, and their production continued under subsequent dynasties until the Sui.
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