Coin Item Number: Edz2875 from the MOA: University of British Columbia
Round, 4-sided hole in centre, rims around outer edge and centre hole, obverse 4 characters, character on reverse. Kaiyuan tongbao (top-bottom-right-left) in orthodox Chinese characters on obverse; luo (top), mintmark, Chinese character on reverse. Extra metal in centre hole.
Normal sized circulating coin
Reverse mould misaligned