Paddy, that is a brilliant "starter for 10!!" It led me staright to the Coronation bronze medal shown here https://www.gbclassiccoins.co.uk/shop/tokens-medallions/1727-george-ii-coronation-bronze-medal/
 
	Bearing in mind the angle of my photo and the poor condition (the other side was so bad I didn't even bother to photo it). I guessed the size, so and original 34mm is quite possible.
 
	It looks like it has been buried in the soil for a century!! Thank you very much for your quick response.  HenryC