Honestly, I came into this coin over Christmas rather than by metal detecting. I probably would have passed out if I have found this with my AT Pro. Anyway, I was hoping someone would have knowledge of British coins. I think it's an 1806 King George III half-penny but I can't be sure. It's heavily worn. I have a 1797 KGIII Penny which is quite a bit larger and heavier than this coin.