Four Chinese characters Kai Yuan Tong Bao / Chinese character Yue (Yue prefecture in Zhejiang), above hole. 24mm, 4.03 grams. Issued in 845-846 AD. Schjoth #383; Hartill 14.95. 

Emperor Wuzong of Tang (r. 840–846) was a fervent Daoist best remembered for the great persecution of Buddhism in 845. Thousands of monasteries were closed and Buddhist bells, statues, gongs, and other bronze objects were confiscated and melted down for coinage. The resulting Huichang Kai Yuan coins, named for the Huichang era (841–846), usually bear a mint or locality mark on the reverse. They were produced using ordinary earlier Kai Yuan Tong Bao coins as mother cash rather than carefully prepared master models, resulting in characteristically soft, poorly defined casts; surviving examples are consequently very often found in worn or rough condition. The Huichang issues are fascinating tangible relics of one of the most dramatic religious persecutions of the Tang dynasty, China's great cultural and economic golden age (618–907).

This coin is unconditionally guaranteed to be authentic.