Qing Dynasty Kang Xi Tong Bao (康熙通寶) 1662-1722AD Booyun (Yunnan province) large-size, Type-1 (Cast 1667-70 AD), nominal weight 1.4 qian. H# 22.131/FD# 2270/S# 1441. Although it's common, it's scarcer than other variety of Booyun. 4.4g, 27.78mm, brass.