Coin Item Number: Ej281 from the MOA: University of British Columbia
Round, square centre hole, outer and inner rims on both sides, 4 characters on obverse, 2 characters on reverse; khang hi thong bao in Chinese characters, read top-bottom-right-left on obverse; reverse has Manchu word boo at left and Chinese character zhong (middle) at right; extra metal in centre hole.
Chinese titles, but believed used in Vietnam