China, 621-718 AD., Tang Dynasty, early Kai Yuan type, 1 Cash, Hartill 14.1.

China, Tang Dynasty (618-907), Tang Dynasty, early Kai Yuan type, issued ca. 621-718 AD.,
1 Cash (24,5 mm / 3,40 g), cast, square central 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" does not touche the hole, [the head of Tong is small], the top stroke of "Yuan" is short, the two stokes in the middle of "Bao" do not touch the verticals.
Rev.: plain (square center hole).
Hartill 14.1 (rarity 14, very common) ; Schjöth 312 ff ; FD 672 ff .