Two large Chinese characters Wu Zhu (=5 zhus), half star above rim / Blank, inside and outside rims. 26mm, 2.96 grams. Hartill #10.2var; Gratzer/Fishman "One thousand years of Wu Zhu coinage" #4.1 

Cast during the reigns of Emperor Guangwu (AD 25-57) to Ming Di (AD 57-75),  Jianwu year 16 to Yongping year 18  (c.AD 40 - 75). Scarce.

This coin is unconditionally guaranteed to be authentic.