Coin Item Number: Edz2040 from the MOA: University of British Columbia
Round coin with a four-sided hole in the centre, and a rim around the outer edge and the centre hole. The obverse has four characters, and the reverse has two characters. Kangxi tongbao (top-bottom right left) in Chinese characters are on the obverse; boo yuwan left, right (mintmark), in Manchu are on the reverse. File marks; extra metal is in the centre hole.
Small size circulating coin. Light weight due to a shortage of copper