i have i belive to be a medal in bronze its marked with King george v and Queen mary cowned 22 june 1911 on the reverse side it has Borough of Bromley june 22 1911 with a port culis with dum cresco spero can any one help many thanks mike
Numismatists (coin and medal experts) would classify this as a medal, since the word "coin" is normally associated with a piece which is or was used as currency and generally accepted as legal tender in the country of issue.
Your item is clearly a commemorative piece issued by the local borough (probably given as a gift or prize or perhaps issued to local schoolchildren) on the occasion of that coronation.