This wu shu-coin was cast during the reign of Emperor Ling (168-189), supposedly in the year 186 AD. The inscription reads wu shu (5 shu). These wu shu's are rather frequent and often well preserved. This leads to the conclusion that they were cast in big numbers yet did not remain in circulation for long. Our coin has a weight of 5.8 shu, it is thus heavier than it ought to be. Since Chinese coins were cast, their weight could differ remarkably.