Coin

Normal sized circulating coin

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. Daoguang tongbao (top-bottom-right-left) in Chinese characters are on the obverse; boo kiyan left-right (mintmark) in Manchu are on the reverse. Crescent on the top reverse; coin is not round; extra metal is in the centre hole; rim flaws; thick darkening coating.