Watch List notes:

NORTHERN ZHOU: Anonymous, 557-581, AE cash (4.47g), H-13.30 var, wu xing da bu, with legend repeated and inverted on reverse, VF to EF, RRR. 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: 300-500 USD