Two large Chinese characters Wu Zhu (=5 zhus)  / Blank, inside and outside rims. 25mm, 2.78 grams. Hartill #10.2; Gratzer/Fishman "One thousand years of Wu Zhu coinage" #p.49.

Late cast, perhaps dating to the 2nd century, crudely cast from an Eastern Han coin.

Cast by Emperors Zhangdi (75-88 CE) to Zhidi (145-146 CE). The character Zhu is written in double lines.

This coin is unconditionally guaranteed to be authentic.