Kai Yuan; 4 g, 24 mm, middle period c. CE 718-732
old label affixed by original collector with "traditional" Chinese character reading "Tang"
O: KAI/YUAN/TONG/BAO (the inaugural currency)
R: crescent above the hole.
Ex: Stephen Album who advised that this came from the "Chang Collection" that was collected between 1916 and 1930.