NORTHERN ZHOU: LOT of 6  wu xing da bu coins, all in EF quality of various diameters, retail value $500, lot of 6 coins.  

The legend translates as  "the large coin of the five elements [metal, wood, water, fire, and earth] ", issued in 574 by Emperor Wu. They were intended to be worth ten bu quan coins, but illegal coining soon produced specimens of a reduced weight and the authorities banned the use of this coin in 576.

Estimate: 350-450 USD