Coin Item Number: Edz2418 from the MOA: University of British Columbia
Coin, round, with a four-sided hole at the centre, a rim around the outer edge and a centre hole. The obverse has four characters, and the reverse is blank. Hongwu tongbao (top-bottom-right-left) in Chinese characters. Rim pits left; centre hole not square; file marks
Normal sized circulating coin. Issue of first Ming emperor.