China, 718-732 AD., Tang Dynasty, middle Kai Yuan type, 1 Cash, Hartill 14.4 u.

China, Tang Dynasty (618-907), Tang Dynasty, middle Kai Yuan type, issued ca. 718-732 AD.,
1 Cash (24 mm / 3,62 g), cast, square center hole,
Obv.: 開 元 通 寶 , Kai Yuan Tong Bao ("The Currency of the K'ai-yuan Period" or "The Inaugural Currency") , top-beneath-right-left of central hole. The "jing" component of "Kai" touches the hole, the top stroke of "Yuan" is longer, left shoulder on "Yuan", the two stokes in the middle of "Bao" do not touch the verticals, distinct vertical parallel lines in the top component of "Bao".
Rev.: top: crescent at angle, over square center hole,
Hartill 14.4 u (rarity of the version with plain reverse 13, common)